Reddit reviews (Pack of 5pcs) Timing Belt Pulley Wheel(20Teeth 5mm Bore) for 3D Printer 6mm Width Timing Belt (20T)

We found 1 Reddit comments about (Pack of 5pcs) Timing Belt Pulley Wheel(20Teeth 5mm Bore) for 3D Printer 6mm Width Timing Belt (20T). Here are the top ones, ranked by their Reddit score.

GT2 pulley with 20 teeth or grooves is one of the best choices for 3d printer construction.Circular arc Tooth Profile Tooth Space is Small, Suitable for Straight Line Driving.It Gives Better Smoothness and Accuracy of Positioning.The GT2 pulley tooth profile is anti-backlash.Package Included: 5×20T timing pulley, 1×Hexagon wrench.

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1 Reddit comment about (Pack of 5pcs) Timing Belt Pulley Wheel(20Teeth 5mm Bore) for 3D Printer 6mm Width Timing Belt (20T):

u/A_Shocker · 1 pointr/telescopes

Yes, that mount
OnStep is DIY. See below for costs/parts of a quick off the cuff build. It does modeling that none of the other consumer level stuff does, and unlike that kit, which does NOT provide it with goto capabilities, OnStep benefits from the massive advances in the past 10 years in digital motor control (spurred a lot by 3D printers. In fact, one of the cheaper OnStep supported boards, if you don't want to solder is actually a 3D printer controller.) OnStep does alignment, and uses an internal pointing model, which honestly the only thing that I know of in the general consumer telescope stuff, even up to things like EQ-6 mounts, is this: https://www.celestron.com/pages/celestron-pwi-telescope-control-software Which I don't use, and frankly just about every report says is great, that one time you can get it working. (It's apparently rather temperamental.)
No it does not. (The $420 skyguider pro doesn't either) However, with the alignment in OnStep, my SVP doesn't have one. My other EQ-5 type does, which is useful, but with alignment, I don't honestly think the polar scope is needed. (Mind, it's useful.)

For OnStep cost/kit: Here's one of the cheaper kits with wifi, and serial support: https://www.stmbluepillkits.com/ ($35 There's a hand controller which is $22, both plus shipping https://baheyeldin.com/astronomy/onstep-esp32-smart-hand-controller-shc.html which is probably $10) Then you can either bend a metal bracket, or use a 3D printed one. (I use a modified version of I think this one: https://www.thingiverse.com/thing:1833860 Look at any of the EQ-5 types here for ideas: https://onstep.groups.io/g/main/wiki/Showcase%3A-What-Users-Built-With-OnStep ) Then add stepper drivers (Several, I think TMCs are the preferred one, but I use DRV8825s which are like $10 for 5, as I have a lot from 3D printing.) and Stepper motors (0.9 degree ones are $23 on amazon^1, but they are cheaper elsewhere) and Belts/Pulleys (Depending on how you want to, I think most people use 60 tooth ^2 and 20 tooth, or 20 & 80 for gear reduction. Plus the belt.^4)

This is a quick response for examples on cost, so if you would like to do it, I can get together what I'd do at this point. (Probably look into which TMCs are setup right.) I haven't included a few things like sensors (<$10) for doing PEC correction, or another motor to allow it to do things like focus (which is REALLY HANDY for AP, though most scopes will require a custom solution. EX: https://www.thingiverse.com/thing:1260785)

So for this, $350 + bracket + 35 + 22 + 10 + 224 + 28+7+13 = 501 + shipping.

^1 https://www.amazon.com/STEPPERONLINE-Bipolar-Stepper-0-9deg-62-3oz/dp/B00PNEQMLY/ (242)

^2 https://www.amazon.com/RuiLing-Aluminum-Timing-Pulley-Printer/dp/B07QWRGCLY/ (28)

^3 https://www.amazon.com/Timing-Pulley-Wheel-20Teeth-Printer/dp/B07RXJ5GVG/ (17, with spares)

^4 https://www.amazon.com/2GT-Timing-Belt-Closed-Loop/dp/B014KKRSLY/ (113, with spares)

If you think that things are worth potentially doing, I can give you a list that's got a bit more time into it.