Best science education supplies according to redditors

I setup what I thought was a wonderful gag for my freinds.

I removed the label from an old vinegar bottle and filled it with hot water. I refrigerated a gallium spoon and moved it into the drawer just moments before my presenation (gallium has the wonderful property of being a solid metal at room temperature and melting at just above room temperature or 85F).

I invited my friend and his wife into the kitchen to show them a trick with "hydrofluoric acid". I opened the cupboard and very very carefully brought out the bottle of "acid". Using both hands I gingerly lowered the vessel onto the counter where they were sitting. I then grabbed a thick clear glass from the cupboard. I took a moment to assure them that the glass was completely inert and there was absolutely no danger; the "acid" couldn't possibly melt through the glass. I carefully unscrewed the metal cap from the bottle, making sure to keep my fingers far from the edges. I set the cap down on the counter and I cautiously began to pour the "acid" into the glass. I did so slowly "I don't want to spill, it will eat right through the granite" I noted. I filled it almost to the very top. At this point my freinds started to look distressed so I assured them again that I had done this before, there was no danger. I then reached into the drawer and pulled out the gallium spoon. I pushed the glass of "acid" closer to them and invited them to watch closely. I inserted the spoon into the "acid" and stirred - almost immediately the spoon melted. For greater effect I held the spoon handle just above the glass and allowed a drop of molten metal to fall back into the "acid" and sink to the bottom.

"Holy shit that stuff is strong!"

"That's nothing, you should see how it reacts to something organic."

I swung around as if to grab something from the refrigerator and I knocked the glass of "acid" into their laps.
That's when the hilarity ensured, at least for me. They jumped up, faster than I thought any human could, and began to scrape the "acid" from their clothes. I yelled "Don't get it on your hands!". They then began a frantic jazz hands act trying to shake off the "acid". "Oh god, I got some in my mouth!" my friend's wife screamed.

Preoccupied with their imminent disfiguration they didn't notice my braying laughter. I stifled my joy just long enough to reveal to them that is was only hot water. It took them quite a while to appreciate the humor.

Buying uranium ore on Amazon: $39.95

Seeing top result from Amazon is a testicle self exam form: priceless

(I kid, but, guys, you really should be checking for testicular cancer especially if you keep your uranium ore in your pocket.)

Ok man... here we go I got a plan for you. You should build a time machine and you could go into the future and spend that $50 on some trees when they were available...

The Plan

You need

• 2718 x 72" Hex 303 Stainless Steel, Cold Finished, Annealed (Might just want to get an even 3000 for replacements and such)
  
  
  
• 200m of high voltage, high temp copper cable, silicon coat is ideal
  
  
  
• 7 x 5L Dewer Flasks with welded handles (And source of LN2)
  
  
  
• 32 x Concave Mirrors
  
  
  
• 32 x Optical Glass Lens Set, 50mm (Half Double Convex (20, 30, 50cm FL) and half Double Concave (20, 30, 50cm FL)
  
  
  
• A well stocked home depot
  
  
  
• An envelope
  
  
  

  The Time Machine
  

  
  
  Take the money you have NOW for the trees and place it in an envelope, and put the envelope somewhere safe. You will be taking this envelope into the future with you. Now, take all the other stuff and go build a time machine.
  
  
  One of the two things will happen
  
  
  

• You fail to build the time machine, but when there are trees around and for sale you can go retrieve those $50 from the envelope and buy them. Who needs a time machine when you got green anyways??
  
  
  
• You successfully build a time machine and become the first human to achieve time travel. Who needs trees when you a have a time machine???
  
  
  The way I see it, its a win win.

Uranium ore... Because it would be cool to tell your friends you have it.

http://www.amazon.com/naturally-contains-Uraninite-radiation-detector/dp/B00CQ9LLR4/ref=sr_1_1?ie=UTF8&qid=1405640168&sr=8-1&keywords=uranium

I built my own cardboard and these are the lenses I used, $1.77 each. I have a cardboard from a kit as well and the lenses from amazon are much, much nicer. I'd guess that in bulk the lenses in a cardboard kit cost less than $0.50 each. It makes this report seem a little bit less credible.

My credit card's been declined!!

That business exists! It's called Amazon!

Wow, your mecury is so impressive! Have some uranium!

http://www.amazon.com/uranium-contains-Uraninite-radiation-detector/dp/B00CQ9LLR4/ref=sr_1_1?ie=UTF8&qid=1394144308&sr=8-1&keywords=uranium

Oh dang! I went to bed shortly after this and wake up to find a bunch of comments!

Alright for the curious yes, it does work and it's in focus despite the very cruddy looking hot glue job. Believe me I was surprised. It goes to show that basic VR is not hard though and now is really the right time to refine this tech.

This is a cellphone DIY job so I can slide in my Nexus 5. The annoying thing was having to carve out places for the buttons so the damn thing wouldn't reboot or change volume when I put it in. I'm probably going to post a bit about how I did it on Tumblr after a couple more additions (blinders, strap) but the construction was about 75℅ luck! The height of the box? Already fits my Nexus 5 perfectly. The distance between the back of the box and the end where I cut the side pieces? Exactly where I needed the lenses to be to focus (about 3-4cm).

Now that I know how easy this can actually be to achieve I'm probably going to give it a second try with 3D printed parts.

These are the lenses I got by the way. I found them thanks to NyxAither's reply in another DIY Rift thread.

https://www.amazon.com/Organic-Chemistry-Model-Pieces-Instructional/dp/B01NCU854K/ref=mp_s_a_1_3?keywords=chemistry+starter+kit&qid=1573426249&sprefix=chemistry+starter+&sr=8-3

Not comprehensive, but some of the bare-bones basics to me are:

• 1000mL beakers
  
• 200mL beakers
  
• 100mL graduated cylinders (glass!)
  
• eyedroppers (glass)
  
• big box of transfer pipettes (can be plastic)
  
• hot plates (in Celsius or Kelvin)
  
• glass thermometers
  
• glass stirring rods
  
• Ring stands
  
• alcohol lamps (you want open flame for some stuff like flame tests)
  
• plastic sample containers
  
• Burettes
  
  For chemical supplies, I would get the highest concentration you can safely store (depends if you have a hazardous chemical safe or not) but it's easy to take a strong concentration and dilute it, but if all you have is like 4% NaOH and you need 40% you're boned.
  
  
• Ethanol
  
• Sodium hydroxide
  
• Sodium carbonate
  
• hydrogen peroxide
  
• hydrogen fluoride
  
• Bromine
  
• Calcium Carbonate
  
• Iodine
  
• Nitric Acid
  
• Sulfuric Acid
  
• hydrochloric acid
  
• Phosphorous
  
• Phosphoric Acid
  
• Sulfur
  
• Glycerin
  
• Borax
  
• isopropyl alcohol
  
• universal indicator
  
  Most of that is pretty safe to store except some of the acids and the peroxide depending on the concentration.
  
  If it's in your budget, also you should really have a flammables cabinet, and a fume hood.
  
  Ohh, also I love the moly-mod kits. Those are great if you can get your admin to get them. Not technically lab equipment, but great for hands on exploring of molecules. If you're doing any organic chemistry I think they're really a necessity and by school standards they're really cheap.

Here's the kit if you want to make a spoon yourself.

Customers who viewed this also viewed: Man nuts

https://www.amazon.com/dp/B008H40M72/ref=cm_sw_r_cp_api_i_qyh2BbA37H0ZN

It’s not stupid expensive. About $20 for 2oz, and you wouldn’t need much for a more modestly sized device.

I messed up the bottom when removing the brim. Next time I will just go without the brim.

This was printed on this hictop printer using hatchbox PLA new right out of the bag. I used Cura with these settings The only modification to the printer is a PRINTinZ printer plate on top of the bed.

Would this work as a radiation source? What are the dangers of having this and storing it in my apartment? Also, is there anything already around my apartment that emits alpha particles view-able in a homemade cloud chamber?

https://www.amazon.com/gp/product/B07HQZCWDV/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

Wow, I love the enthusiasm, thanks for asking! Most of this shot was done entirely in-camera. I'm covering the top-right of the frame with a triangular-prism-shaped crystal. The crystal gives off reflections and is also causing that rainbow-colored fringing. In the top-most-right you can see the street scene reflected with the aforementioned fringing and the bottom right you're actually seeing the reflection of the blinds that this image was shot through. DoF was narrow enough that you cannot actually see them in the bottom left of the image. You can also see a third reflection of the street scene in the middle of the image reflected and rotated 90-degrees to the left.

Happy to answer any other questions you have!

P.S. Here's the crystal I was using if I didn't describe it well enough.

These are also what a photographer uses for that rainbow effect you've been seeing on a model's face in portraits. Seen here

I found something for you: Testicle Exam Form

Hopefully these will let you find your balls. If you're dating someone and your arguments always go like that, you're doing it wrong.

For the love of all things 3D printed, don't tighten any nuts or screws until the guide says. It is poorly designed in that regard. Also take care aligning up the Y-axis rods to be parallel , just a few degrees off will cause jerking and squeaking because the bearings are tighter at one end. Also be careful with the X-axis belt, it can start rubbing if not aligned very close with the motor, head, and holder.

After assembling my own about a month ago, I highly recommend the following upgrades:

• Vibration damper feet. (This cuts the noise by 90%)
  
  
• Printed linear bearings (the bearings shipped started making grooves in the rods in about a week. You can also print the bearing holder, I made my own which I might upload sometime.)
  
  
• A new carriage plate, like this one (not a super urgent upgrade, but it fixed most leveling problems, and the plastic one Prusa sent was warping.
  
  
• Y-belt holder and tensioner (This has saved me a lot of annoyance. I am probably going to mod it so the screw presses against a wedge and not the large screw. I used M3 screws, just resized the holes.)
  
  
• X-Belt tensioner (Have not made this, but it is on the to-do list).
  
  
• Spool holder (This one is super nice)
  
  
• Filament guide (Might want to change the angle a bit if used with the spool holder, but it works without any mods.)
  
  I am considering a cable chain as the cables are starting to shift after just a few weeks of printing.
  
  There are also a few mods to adapt the side fan port to handle a 40 mm fan that is quieter. I am making an adapter for a different fan as I type this, results TBD.
  
  I found this site handy as a quick reference for bed leveling. The info is in the guide too.
  
  Best of luck!
  

Are we looking at two different things? He linked to this Amazon page: https://www.amazon.ca/HICTOP-Desktop-Accuracy-Self-Assembly-Tridimensional/dp/B00N7I1ZVU

In the 4th picture it shows a close up of the lead screw.

I sure wish that I could afford one of these "desktop printers" but unfortunately they are still a bit pricey for me especially considering that the holidays completely broke me and the wife. Here is the cheapest i found while doing a quick amazon search :

HERE


And here is the one that i would totally get i i had the cash:

HERE

Gift One: This real bat encased in an acrylic block. Obviously I don't need it, but I really really want it. Bats are my favorite animal and I think it would look awesome hanging out on my dresser.

Gift Two: Low carb chocolate chip muffins. Help me stay on my diet! C'mon...gimme. :D

Thanks for the contest, you guys are so awesome!

I was going to say "testicle exam" until I found this. WTF?!

U dont need software, buy a prism https://www.amazon.com/Amlong-Crystal-Triangular-Teaching-Spectrum/dp/B00FHFV9AI

Search youtube vids how to use prism to get the same effect

https://en.wikipedia.org/wiki/Ferrofluid

https://www.amazon.com/CMS-Magnetics-Ferrofluid-Magnets-Dropper/dp/B008H40M72

https://www.amazon.com/Thekkiinngg-Double-Sided-Textured-Powder-Coated-Version/dp/B07HQZCWDV/ref=mp_s_a_1_4?keywords=prusa+mk3&qid=1559257868&s=gateway&sprefix=prusa+&sr=8-4

You can buy it new for less.

https://www.amazon.com/HICTOP-Desktop-Accuracy-Self-Assembly-Tridimensional/dp/B00N7I1ZVU

Εγώ δεν είμαι ρατσιστής, θα πάρω αυτό.

Glue stick is definitely a great way to reduce adhesion. It works great until that one time when you forget to do it, and then you end up ruining your PEI sticker.. I've done that twice to mine.

I switched to the textured PEI sheet, and it's no worry at all- no glue stick needed, it cools and the prints pop right off even with PETG. Since the PRUSA sheet wasn't available, I ordered one from "Thekkiinnggg" on Amazon. Link here: https://www.amazon.com/Thekkiinngg-Double-Sided-Textured-Powder-Coated-Version/dp/B07HQZCWDV - it's a little pricey at $50 plus shipping, but works great.

> Is that also true for unmagnetized neodymium?

Yup! For almost all magnetic materials the permeability will be the same whether or not they are "set". One exception is in extremely high quality transformer steel- this stuff is specially rolled so its anisotropic. It's flattened into strips, which squishes its crystal structure into very long, thin needles. The atoms inside the needles can flip around easily, but they can only line up in the direction of the needles. They swap back and forth very, very easily, but they can't do the same for side-to-side fields. Once they're set they have great permeability in one direction and mediocre permeability in other directions.

Neodymium magnets have essentially the same structure- very long needle-like magnetic sections, but they're extremely resistant to being turned around. Even the individual neodymium atoms (which are the field-carrying component) are essentially locked in place by their chemical bonds. Iron atoms on the other hand can rotate almost freely; that property is the same one that makes iron (and metals in general) ductile, since the atoms can move with respect to each other.

One of the most important parts of making neodymium magnets is actually an annealing phase, where the magnet is heated for a very long time to line up the magnetic sections. This also has to be done in a low-oxygen atmosphere, and is one of the big reasons neodymium magnets are expensive. Without annealing the magnetic fields cancel each other out to a large degree, so an un-set magnet can have an even lower permeability than a set magnet- but a set neodymium magnet will have almost zero permeability in directions other than the magnetic field.

> I bought some neodymium magnets several years ago to play with and they are amazingly strong.

I love them! Pick up some ferrofluid too, but be careful as it will stain anything practically permanently. The color comes from nanoscale (<10 nm) iron particles that will just nestle into cracks on anything less porous than glass, which is essentially everything. Ferrofluid got me the brainwave of understanding why iron particles line up the way they do.

Another cool thing is that we're finding requirements for even stronger magnets! In very high-end motors, it's becoming more common to use "funnels" of electrical steel to concentrate the power of magnets even farther. Pairs of magnets are tilted to form a triangle with the surface of the rotor- the flux is forced down into a smaller area, making it even stronger! That gives motors more torque for their size.

It's working pretty well. The Tuscany demo is on the Play Store for free so I started with that and even at 20fps it looks good. The frame is just foam core poster board and hot glue and these are the lenses I used: http://www.amazon.com/gp/product/B008FRFV4K/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

At the time when I was first ordering, the link that Google provided was sold out so I searched amazon for an alternative. I don't know anything about lenses though, and I didn't realize double convex and bi-convex were not the same thing.. so I ended up with these: http://www.amazon.com/gp/aw/d/B00BIKGMZ8 . In addition to not being the correct style of lens, they're also too big (50mm diameter instead of the 25mm they are supposed to be. )

You can replace it if that doesn't work out. I've been tempted to get this to try 3 point bed leveling. I'd also be worried about the state of your smooth rods.

Edit: turns out the size is different

If you have time to wait, buy one of these: screw in stud thermistor. It uses the same thermistor as the Printrbot, and it's so easy to use!

I LOLed at the comments on this one

Link to the product itself: http://www.amazon.com/3B-Scientific-W43014-Testicle-Self/dp/B005OSVZN4/ref=cm_cr_pr_product_top

(sorry about breaking rule #3)

A large enough supply of Rare earth, high grade uranium ore contains "Uraninite" for Geiger counter / radiation detector test source ~38k CPM! by LifeTech http://www.amazon.com/dp/B00CQ9LLR4/ref=cm_sw_r_udp_awd_zELgtb02S8NAJ

Umm...

Kinda?

Well, this is pretty cool.

That's really thoughtful of you. I'm sure whatever you end up getting he will really appreciate.

The first thing that came to mind is a really nice journal/organizer, but I'm not sure if that's just something I would appreciate, or if normal people would also like something like that.

... I also googled presents to get doctors, and chuckled with this idea.

I see the Prusa i3 and this one on amazon saying its a prusa i3 and they look different. Are they just different generations (you mention mk2) or is the amazon one just a knock off? Due to shipping the amazon would be much better but dont want to order one that turns out to be junk.

https://www.amazon.ca/HICTOP-Desktop-Accuracy-Self-Assembly-Tridimensional/dp/B00N7I1ZVU

Thekkiinngg Prusa i3 MK3/S Mk2.5 Double-Sided Pei Textured Powder-Coated MK3 Spring Steel Sheet V4 Version 4 https://www.amazon.com/dp/B07HQZCWDV/ref=cm_sw_r_cp_apa_i_Oac7Cb6KG4327

Still pricey. Got it before Prusa got theirs back for sale, though.

https://www.amazon.com/Life-form%C2%AE-Infant-Circumcision-Trainer/dp/B0151ALHNW/ref=pd_sim_sbs_236_2?ie=UTF8&dpID=41t7aKi8sCL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=01TJYN2NR92G0FTWX1GC.



Customers who viewed this also viewed gallon drums of lube. I hope I am not on a list somewhere after looking at this.

I do not want a boat like this.

http://www.amazon.com/dp/B000NOC52Y/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2KV8ZE36VV290&coliid=I2UFB8C2ZJ2L3X

THIS THING IS SO DAMN CUTE IM AN 18 YEAR OLD MALE IN COLLEGE BUT FUCK IT I WANT THIS IN MY ROOM

im also a biology major so i like this kind of stuff.

This was the best $15 I ever spent since my pc hooked up to my tv, using it right now.

For out of the ordinary, there's this?

buy uranium clearnet here

Or... someone bought the gallium spoon kit

Bug discovery thing My 5 year old niece loves it.

Common cold plush Some parents use this to explain bacteria and viruses to children and how it makes you sick.


Mix between the bug discovery and a microscope, but really kid friendly

They also have a kid friendly telescope

Periodic table with samples of stable elements ~$180, make sure you're getting the one with the actual element samples in it if you go with this, some just have pictures which are neat, but not as good.

Glass Klien Bottle $65

Blue Morpho Butterfly $50

Fun fly stick $25

Megan Lee Studio's Art Prints $5 - $600, she has a lot of great prints if your friend has some favorite scientists. Great decor for home or classroom.

Which science discipline does your friend teach/ majored in?

Thanks, I will definitely use those tips! I just ordered this https://www.amazon.com/Test-Buddy-ACT-36-for-ACT/dp/B01E0CS5L4/ref=cm_cr_arp_d_pdt_img_sims?ie=UTF8 and I am hoping this will help move me along.

Klein Bottle, it can be pretty expensive though.

Nope, it's not your fault. The bottom carriage is warped, not the bed. You'll need to buy:

https://www.amazon.com/RepRap-Champion-Anodized-Aluminum-Carriage/dp/B01FV17EL0

and bolt the old carriage to the new one using the holes on 4 corners (they are spaced the same on both). Then drill the proper holes in the newer, thicker plate using the old plate as a template. Separate the two plates and put the new one in. While you're at it, you may want to replace the bearings.

This. I really want this. I really, really do.

Hmmm...its so hard to choose one-
Top 5 items you NEED:
[A pen/tape dispenser] (http://www.amazon.com/The-Butt-Station-Accessory-Dispenser/dp/B001KXRKY0/ref=sr_1_9?ie=UTF8&qid=1367968447&sr=8-9&keywords=funny+office+supplies)
[A red stapler] (http://www.amazon.com/Swingline-Limited-Edition-Business-S7074736E/dp/B0006HUQZ6/ref=sr_1_40?ie=UTF8&qid=1367968558&sr=8-40&keywords=funny+office+supplies)
[A To Do List] (http://www.amazon.com/Honey-Badger-Notepad-Office-Yellow/dp/B006WFLB5A/ref=sr_1_6?ie=UTF8&qid=1367968447&sr=8-6&keywords=funny+office+supplies)
[A piece of art] (http://www.amazon.com/American-Science-Surplus-Inflatable-Painting/dp/B003YPEOVE/ref=sr_1_2?s=toys-and-games&ie=UTF8&qid=1367968688&sr=1-2&keywords=inflatable+window)
[A friend to share] (http://www.amazon.com/Giant-Microbes-Common-Rhinovirus-Plush/dp/B000NOC52Y/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1367968598&sr=1-2-catcorr&keywords=giant+microbes)

I hope you find something great. [Here] (http://www.amazon.com/13x19-Caught-Again-Joyner-Poster/dp/B009CCNG76/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=1L8ON2MX2QPTV&coliid=I2DA6R4SUGOOI) is my item. It is a poster I want to get my brother so he can decorate his room. Thanks for the contest.

Well, you can't get plutonium. But you can buy uranium here and here

You can also buy one of the plutonium cell props from the movie here

God damn I love Amazon...

Best Buy is closing stores because they have a lot of redundant real estate (the press release mentioned having Best Buy and FutureShop locations practically next door to each other). Target closed stores because they couldn't supply them adequately and shoppers had no reason to go there, so they were losing millions of dollars. That's a very different scenario.

As for Amazon, a) they're losing tons of money, so Wall Street is no longer as willing to overlook their faults as they were in the past, and b) I think people are reaching the limits of when and how online shopping is useful. The reason people purchase online is when it's not available in a store, or it's cheaper than buying it in the store. But now most retailers offer price-matching, so that takes away a lot of incentive. If you have a choice between seeing the item in person and buying it immediately, vs. waiting a few days and hoping UPS doesn't drop-kick it all the way to your doorstep, then you might not be willing to wait.

Amazon has an advantage in that they sell everything (you can buy fucking uranium on Amazon, for chrissake) and they have a robust drop-shipping and third-party function. Target and Best Buy aren't selling mattresses, bedroom sets or power tools (or uranium), that's not their niche. And that's fine, retailers don't have to be everything to everyone. But at the same time, for the items which Amazon does have competition from brick-and-mortar retailers, the incentive to pick one retailer over another (which is to say, price) is dwindling.

Keep in mind that a lot of the ongoing maintenance of brick-and-mortar stores is to keep an eye on traffic flow and purchasing patterns. If a store doesn't get enough business to justify its presence, why keep it open? The shift in retail for chains that also have a significant online presence is to keep the profitable stuff on the floor, to carry a decent if incomplete variety of those items, and to move most of the loss leaders to the online channel. That's why, when you walk into a store today, you'll see a ton of tablets, phones, cameras, TVs, computers and appliances, and accessories for all of the above, but you see only a comparatively small selection of music, movies and videogames. It's silly to dedicate 3/4 of the sales floor to music and movies when they actually lose money. But websites are cheap as hell, so it's a lot easier and more sensible to maintain a complete media catalog online and ship on demand, than it is to buy a bunch of inventory and hope it sells (especially when we know people aren't buying hard copies anymore, because this is 2015 and people stream now). It makes more sense to keep the most popular electronics and appliances on the floor, and then offer an expanded selection online for people who might want a special color or model, and are willing to wait a few days. Inventory and real estate are expensive, and you want to make sure that you're dedicating your square footage for the items that give you the best return.

Here ya go they already got my money

the larger sized one is black lmaooo

This is the thermistor I purchased: https://www.amazon.com/gp/product/B00THZJIY8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I don't see why you couldn't. What could possibly go wrong? Or you could start fresh

I would love a copy of saints row The Third-full package I have linked the weirdest thing I've ever found on amazon...that I kind of want

I have this one: https://www.amazon.com/gp/product/B00N7I1ZVU/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 Price is good and once you get it dialed in works really well.

https://www.amazon.com/dp/B01E0CS5L4

What if I do nothing? Isn't that still doing something?

Also: Did you know you can get uranium on Amazon? True story.

https://www.amazon.com/Test-Buddy-ACT-36-for-ACT/dp/B01E0CS5L4

I got this one and it really helped me get the timing down act switching from the sat. It has timer presets for each section and tells you what question/passage you should be on. The only downside is that it is cheaply made and overpriced, but in the end it gets the job done.

It does count up tho so if that does would work for you I’d go with a different one.

https://www.amazon.com/Test-Buddy-ACT-36-for-ACT/dp/B01E0CS5L4

This is awesome. I used it for my test. Maybe it gave me luck for my 33

A bag of bones, a katana umbrella, or maybe dragon forks

The best part is that they are sold out of these:
http://www.amazon.com/3B-Scientific-W43014-Testicle-Self/dp/B005OSVZN4/ref=pd_sim_sbs_ol_4

If you don't mind assembling it, it should be fine for a first printer... but it appears to be cheaper here: http://www.amazon.com/dp/B00N7I1ZVU

I searched for uranium ore and I was given a "testecle self exam" Pratice sack

http://www.amazon.com/3B-Scientific-W43014-Testicle-Self/dp/B005OSVZN4/ref=pd_sbs_indust_6

shipping weight is 8 pounds. odd.

I'm more concerned by this, found under "Customers Who Viewed This Item Also Viewed"

Here

I just starterd Org. Chem 1 and this $21 model kit has been super helpful to me. It can do single, double, and triple bonds well, the colors are super vibrant, and it all fits well in the little box it comes in. I don't know about cyclohexane, but I make benzyne rings all the time and this helps me understand degrees of saturation and unique carbons and hydrogens, too.

https://www.amazon.com/Organic-Chemistry-Model-Pieces-Instructional/dp/B01NCU854K/ref=sr_1_4?keywords=atom+model+kit&qid=1569186732&sr=8-4

rotate it in front of the lens to create unique reflections and flares!

​

https://www.amazon.com/Amlong-Crystal-Triangular-Teaching-Photography/dp/B00FHFV9AI/ref=sr_1_1_sspa?keywords=prism&qid=1550083058&s=gateway&sr=8-1-spons&psc=1

​

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have fun with this

You sure can.

cheaper ferrofluid: https://www.amazon.com/CMS-Magnetics-Ferrofluid-Magnets-Dropper/dp/B008H40M72

a leaking glass that looks like you can drink out of it, but it turns out you need to use CLI to do anything meaningful an extremely convoluted process to get the liquid in your body. Oh, or just put it in a klein bottle.

RotoMetals Complete Disappearing Gallium Spoon Kit: https://www.amazon.com/dp/B00PG3KUT2

I like that there's a black baby version too

It's not by the pound but:

• https://unitednuclear.com/index.php?main_page=index&cPath=2_4
  
• http://www.amazon.com/uranium-unrefined-uraninite-radiation-detector/dp/B00CQ9LLR4
  
  Also, you can just pick it up off the ground in a few places in the US. The hard part is refining it.

I replaced it with this thermistor - which is a 100k thermistor with an M3 stud. I'm having trouble finding exactly which thermistor came with my Prusa i3 - is the fact that it was also 100k enough?

This is pretty close to the one I had. I got one at my school's bookstore, but that one look pretty similar. They help a lot with the cyclohexane rings and chair structures, for me. Also, if the school you go to has a workshop section that goes with the class, that might help. My school had a section with a TA and several other students who would go through the practice problems together.

>What is your price range?

I'd prefer around $200, but will go up to $300 as a max.
>What do you intend to do with the printer?

Small figures and plane/boat models.
>Are you interested in assembling a kit or would you prefer to purchase an assembled printer?

I'd be fine with either, but the kits seem to usually be cheaper.
>Did you read this FAQ?

Yes I did.

I haven't 3D printed before, so this'll be a first-time experience for me. I was looking for something in the $200-300 range that's reliable enough that it won't easily break down and has a decent amount of customers online who might be able to help me. I would ideally like a printer that can print smaller, finer details and has a larger printing area (7x7x7 inches or larger).


I've been looking at some printers that seem like they might be pretty good, but a lot seem like they are probably cheap knockoffs (I'm fine with a knockoff as long as it works). I'll list them here to see if anyone thinks they're good ideas, but feel free to let me know of any others.


The ones that I thought looked good were:

Anet A8, ALUNAR M505 - It says "CNC" in the name... Does that mean it's subractive? I might not like it if it is.


Some others:

MicroMake C1, HICTOP 1 or HICTOP 2 (I can't find specific printer names), Wanhau Duplicator i3 V2, TEVO Tarantula

I also have a coworker who said he'd sell me a da Vinci 1.0 AiO for $100, but I'm a bit wary of buying. It has a good size, but the prints I've seen online don't look too good to me, and I've read that you need to buy specific filaments that are more expensive.

Here's the brown one: http://www.amazon.com/Life-form®-Infant-Circumcision-Trainer/dp/B0151ALHNW

Probably something like this, very popular prop in photography.

The other day in another thread someone linked to a video explaining how to use different prisms and reflectors for this kind of effect.

I searched "uranium ore" on Amazon and this came up.

I have an acrylic one, it came totally disassembled, so I think like the first one.

http://www.amazon.com/HICTOP-Desktop-Accuracy-Self-Assembly-Tridimensional/dp/B00N7I1ZVU

There's not a whole hell of a lot they don't sell.

https://www.amazon.com/uranium-unrefined-uraninite-radiation-detector/dp/B00CQ9LLR4

Powdered Textrued PEI sheet will solve it, and don't need glue. But you can't order them from Prusa, you can order them from Amazonhttps://www.amazon.com/Thekkiinngg-Double-Sided-Textured-Powder-Coated-Version/dp/B07HQZCWDV/ref=sr_1_8?keywords=PEI+sheet&qid=1554953393&s=gateway&sr=8-8 but it's quite expensive. Recently I found a store in Aliexpress sell them, with good price. https://www.aliexpress.com/item/Double-Side-Powdered-textured-PEI-Sheet-for-Prusa-i3-MK2-5-MK3-3d-printer/33002519665.html?spm=2114.search0604.8.13.216c48a16boPks

I figured mine out. When I was unplugging the hotend thermistor to test it, one leg separated inside the black heatshrink. I pulled the heatshrink off both legs and found some of the shittiest solder joints ever. I soldered both legs and have had no def error since.

The soldering was a huge PITA since I couldn't make a mechanical connection first and whatever metal the probe legs are made from didn't want to bond to the solder. I eventually got it to hold.

Before I fixed it, I had already ordered this thermistor which screws into the M3 hole. We'll see how it does.

Here are some links for the product in the above comment for different countries:

Amazon Smile Link: on amazon


|Country|Link|Charity Links|
|:-----------|:------------|:------------|
|USA|smile.amazon.com|EFF|




To help add charity links, please have a look at this thread.

This bot is currently in testing so let me know what you think by voting (or commenting). The thread for feature requests can be found here.

I'm confused as to what you're asking here.

You've identified the source of your problem, the y-axis carriage plate is bent. No amount of sticking washers over/under the build plate is going to fix that, you just need to replace the carriage. The leveling issue is going to keep getting worse since the aluminum is already bent it will just keep bending as you apply more and more force to try and level it.

Buy one of these, use the old carriage plate as a template to drill new holes and then mount it. Or if you don't want to drill new holes you'll have to print adapters that will let the new plate use the y-axis rails. These are a good starting point but you'll have to either move the y-axis limit switch or modify one of them so it still work, plus you'll need a new timing belt mount. If that's the route you want to go, let me know I have already designed all the modifications and can give you the files that I used to fix my printer.

The one I got was the cheapest one off of Amazon ( https://www.amazon.com/gp/aw/d/B00N7I1ZVU/ref=sxts1?ie=UTF8&qid=1473946830&sr=1&pi=AC_SX236_SY340_FMwebp_QL65)and I have yet to mess with the steps/mm they are athe what they came as which is 2565 or something like that.

Thekkiinngg Prusa MK3/S Double-Sided Textured PEI Powder-Coated Sheet V4.

https://www.amazon.com/gp/product/B07HQZCWDV/ref=ppx_yo_dt_b_search_asin_title?

It's been great. I may have even gotten the V3- it discolored just a touch when I first printed on it, just kind of a weird rainbow effect in the right light... but it's been printing like a champ for the last 500 hours or so of use. In fact, I'm printing Terminator Rex on it right now. =)

https://smile.amazon.com/gp/aw/d/B00BIKGMZ8/ref=mp_s_a_1_9?ie=UTF8&qid=1501301361&sr=8-9&pi=AC_UL420_SR280,420_FMwebp_QL65&keywords=lenses

Looks like they're designed for classrooms. There are other packs about the same price with different selections.

That is exactly what I have. So the Prusa i3 is "open source", anyone can make one. These guys did a good DIY kit with some helpful videos. The one upgrade I made that made all the difference in the world was:

https://www.amazon.com/gp/product/B01FV17EL0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

The acrylic carriage was way too flexible. Using this instead took care of 90% of my frustrations leveling the print bed.

Here is the mobile version of your link

This is what I saw on Amazon when I clicked a top-of-reddit-page ad that said something like "I was looking for Uranium, how did Amazon know I wanted this?"

I just ordered this Prusa I3 https://www.amazon.ca/gp/product/B00N7I1ZVU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Where can I find a crash course on 3D modeling? What software would work best this this unit? I'm looking to make small robotic parts, panels, gears, stuff like that.

I'm a bit confused about this, but, if your father died yesterday of lung cancer, I am sorry to hear that.

PS: Those are pictures of Steve Jobs. And, the linking is backwards.

nice

pictures

i had a 1405 and had the weak fet issue . sigh. just bought and assembled this: http://www.amazon.com/gp/product/B00N7I1ZVU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 and all i can say is wow.

You can them near this size on Amazon for like 10$. I got one for my geology major friend.
http://www.amazon.com/Bismuth-Crystal-75-1-25-Inch-Info/dp/B0044YFP80/ref=sr_1_2?ie=UTF8&qid=1396216161&sr=8-2&keywords=bismuth+crystal

You mean like these http://www.amazon.com/3B-Scientific-W43014-Testicle-Self/dp/B005OSVZN4/ref=pd_sim_sbs_ol_4 or this
http://www.amazon.com/gp/product/B000SON5IC/ref=cm_cr_asin_lnk

Definitely this, they also come in black too if you have preferences.

You sir, have inspired me to remember when I was first inspired: Steve Jobs' Coal! Make sure you take a look at the customer's images to see it all, and thanks for helping me end my Friday work-day =)
edit: sorry for tinypic, my work firewall won't allow me on Imgur

>Ohh, I see we're moving the goal posts again!

There's no moving the goalposts. The definition of WMDs is the same as it has always been: weapons capable of causing mass destruction. Weapons that can kill a lot of people.

http://www.thefreedictionary.com/weapon+of+mass+destruction

These weapons cannot kill a lot of people. These weapons are most likely to kill anyone who tries to use them.

>You mean this yellowcake?

Do you actually understand what yellowcake is? Or that there are different isotopes of Uranium? From that article:

>nuclear material that Iraq says was stolen from a university

>...

>Bob Kelly, who was a U.N. nuclear weapons inspector in Iraq in the 1990s, told NBC News that the uranium probably posed more danger as a toxin, like lead, than as radioactive material.

>“Putting it in a dirty bomb is a pretty silly idea,” he said. “If you spread uranium over a large area, it is just going to disappear.”

The article makes it pretty clear that this is the type of uranium you can buy on Amazon, not the kind you can use to make weapons of mass destruction.