Parts
Computers
Wheel rollers
Designation: V623ZZ

Dowel pins used as roller shafts have a diameter of 3 mm and a length of 8 mm.
Dowel pin shop links:
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DIN 7 / ISO 2338
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DIN 6325 / ISO 8734
Motors
Wheel motor
Pololu 19:1 Metal Gearmotor 37Dx68L mm with 64 CPR Encoder

Product page:
3D model:
Store links: