Best linear motion guides according to redditors

Mmm, kinda. Except there's logic going on here, simple as it may be. So that would require some extra gear and controllers. It would be one thing if it was 8 separate arms, then you could assume he'd just strapped 8 kits under there. But it's one arm on what I am assuming is a screw/servo, something like this. And it tracks the toggles and toggles them in the order they were toggled, (which would require a tiny amount of editable memory). UNLESS the switches are clicked simultaneously, then it does the right-to-left in order. All the while managing/resetting the timer on the servo that's holding the lid open.

If it was me, I'd be looking to emulate this with more of a Arduino, or Raspberry Pi programmable controller solution than a simple kit you put together.

I think one of these should work. The thingiverse mentiones 45cm long, which is roughly 17 inches, so I think a 16inch or 19inch should be fine without cutting.

https://www.amazon.com/Hardened-Chrome-Linear-Motion-Shafts/dp/B01LXAZFKZ/ref=sr_1_3?keywords=8mm+rod&qid=1566315274&s=gateway&sr=8-3

https://www.amazon.com/ReliaBot-Hardened-Chrome-Plated-Linear/dp/B07DPFH7HL/ref=sr_1_5?keywords=8mm+rod&qid=1566315497&s=gateway&sr=8-5

You could always just buy these and also get a saw. Alternatively, use this page, select the approximate size of your rod (in this case 8mm/251-498.5mm) and then enter the exact length you need in the "customize" section before adding it to your cart.

I upgraded to 8mm smooth rod using these:

https://www.amazon.com/gp/product/B01DLYMRDO

https://www.amazon.com/gp/product/B01LYXHTHI

https://www.amazon.com/Mercurry-Details-Linear-Support-Aluminium/dp/B01HGIWF06

No ragrets. You will have to drill mounting holes for the SCS8UU bearings near the inside of the plexiglass build plate carriage.

Can't confirm these are the ones I got but they look like something Id buy, i just look for case hardened. If you dont have long lm8luus check those out too. And white lithium grease lube

https://www.amazon.com/Hardened-Chrome-Linear-Motion-Shafts/dp/B01LXAZFKZ/ref=mp_s_a_1_3?ie=UTF8&qid=1525048454&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=8mm+linear+shaft

I purchased a single block from amazon, I was planning on dumping the bearings out and taking the measurements of a few to see what standard size they match most closely with. As for the rails themselves, I haven't decided on which ones to go with, the Chinese ones I've seen all look so jagged and poorly formed.


For the angle of motion of the igus rod ends I've done something a little different from a design standpoint. Instead of mounting the rod ends parallel with the bed I mounted them perpendicular and at a 60-degree angle. The reason I did this comes from a thesis paper that I found Design, Construction, Control, and Analysis of Linear Delta Robot. From the simulations, I did in fusion 360 it seems that the effector is just able to reach the ends of the bed with the angles allowed.


Wobbly was a bit of a worry I had, I'm really looking for a stiff and rigid frame and I absolutely love that hexagonal design you have for your delta. I would have used a hexagon but didn't want to have to deal with so many extrusions. At the moment my design uses Misumi 60 degree extrusions for the height of the frame.
With these current extrusions, I have no real way to connect the linear rails to them. I have however found these extrusions from Germany and would like to try and acquire three, although they may require me to rework everything in 4040.