Here is my attempt on pulleys. I did this a while ago you should be able to easily export as stl but you might have to create an account.
I printed them and mounted them but I haven’t finished the build and so haven’t ridden on them.
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Good looking pulley!
Might have to print one out just for shits and giggles
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There’s several good guides around on YouTube and other parts of the internet that will hold your hand through designing a htd pulley properly, it’s a fun little project
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This is a bit smaller than would fit in a wheel and not what it’s for and I post it just to show how cheap 3d printing steel at jclpcb is and it cost $41 with shipping and the part is only $18. Cheaper than for them to machine it.
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Has anyone made any sort of belt cover for Precision XL motor mounts?
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I’m aware of the risks and yes it’s pla.
This is only gonna be a 6s low speed build. So catastrophic failure shouldn’t be too bad.
I’ve got a better 3d printer now so if they need to be replaced I’ll print in abs or ASA
I’ve actually used 3d printed pulleys for a while even from PLA, and they worked well. Only issue is that the teeth wore off fairly quick and then belt slippage got worse and worse over time.
I’d say my PLA pulleys lasted me like 150 miles? After that there just wasn’t enough teeth left to work well at high torque especially when braking. But I was pushing 100 motor amps so… Fair enough I guess
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Ive got about 300mi on a set of PETG printed pulleys. They are holding up fine, though they are 72t so the load is spread over a lot of teeth. The smaller the pulley, the worse idea it probably is to print them.
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Yeah mine were 30T on a long mount, although idlers made the situation better
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putting this here for visibility
M1Cover.STEP (723.0 KB)
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My brothers low speed board has been running petg pullies for 500ish miles and the teethe still have layer lines. I printed him a set of petg-cf but he won’t need them for a while.
Also found and printed an anti sink plate for my thane pintail and made some petg risers for hyper trucks if anyone wants them. Trying to use up the last few grams from a couple rolls so Seahawks colors for the 49ers fan 
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After 1 year and way over 1000km my PETG pulleys are absolutely fine. I’ve worn 2 sets of belts. There are some minor chips and cracks on the edge from hitting rocks and curbs:
My board is underpowered though, 12s @ 30A phase amps, 35kph erpm limited.
PETG 0.2mm 7 perimiters 11 layers. Clear PETG seems to be stronger than black.
Oh, and the model:
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I wouldn’t trust PLA though, it tends to warp at pretty low temperatures. Direct sunlight in summer + tension might cause PLA pulleys to deform.
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Why?
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Looks like a good amount of tie down points