Cheap Ass 6x2 Pneumatic Belt Setup. 3D printed Pulley/ Vex Versa Pulley. Thingiverse link in post #534

Ah sorry. Edited link.

Adapter is to help align the wheel gear and to allow the wheel itself not to be bolted to the gear.

Will share once I have tested a little more…

is there a calculator like we have for belts, but for gears. because i have no clue how to calculate the needed distance.

Since people don’t want to 3D print the pulley or don’t have access to a 3D printer. I made an adapter to use with vex robotics versa pulley. It’s a much smaller part to print and won’t take a lot of money. I have ordered a couple of vex robotics 60T pulley to show you guys how it fits. I can send them to whoever’s interested. Pay me shipping + what I paid for.

Files at

versa_pulley_adapter versa_adapter_on_hub ! vex_versa_assembly vex_versa_assembly2


duude you are the man. i am probably going to use a reshipping service to get vex pulleys to germany, before the mad max brexit happens. @mishrasubhransu where are you located?

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I’ll DM you.

Here’s my Delrin cnc router solution…,

image image image image image image image


Nice! I like that you are using all 6 screws. Maybe I’ll update my design.

Do you have a pic of your cnc router? How much did it cost?

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Thanks! The router belongs to the school I work for… it was around £4K and is not the best! It copes with Delrin well enough though.



Problem I am having is these wheels drink battery juice for breakfast!! I was expecting 20km range on my mini AT build, looks to me like I will only get about 15km.

I noticed a ~50% increase in energy consumption compared to my 83mm 75A Flywheels. Definitely worth it for the softer ride (the roads are really bad in my area).

What PSI are your wheels inflated to?

Wow 50% is bad!! But yes seems about right…

I have these at maximum PSI of 70.

Double the energy consumption for pneumatics has been the rule of thumb for like 2 years now.


So it works. Works pretty well. The vex pulley adapter is just 1cu inch. So probably less than a dollar to print. Now if only I had a motor to test everything. IMG_20180929_015052 IMG_20180929_022016 IMG_20180929_021245


I’ve used m4 bolts and I can’t find any m4 nuts that sit in the vex pulley nicely… I hate using imperial parts but it looks like the way to go!

Was the pulley 3dprinted?

No, I bought it from these guys,

Seems i am late. The prices rised a lot

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what price?

Not 69$ for 4 wheels anymore. I see 18.72€ each

you can still get them cheaper, but there is a difference. The one version that is cheaper can only take 40psi and the slightly pricier can take 70psi.

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Hi Guys,

I wonder if these tyres will fit these cheap rims. They may reduce the rolling resistance and increase battery as there is less tyre in contact with the road.