This is a mecanum wheel based off of Zaggo's design. I beefed up the area around the bearings and made the rollers a little wider. I found that without the thicker area around the bearings, the plastic cracks and breaks off. I have uploaded two versions. One accepts an 8mm shaft and the other accepts the standard 5mm stepper motor shaft. A short video of their operation: https://www.youtube.com/watch?v=NohwUDOjMZYPrint two regular wheels and two mirrored wheels. Each wheel takes 16 rollers. I printed the wheels at 70% infill and the rollers at 40%. To assemble 1 wheel the following is needed: 8x M4x60mm bolts 8x M4 nuts (lock nuts are ideal) 8x 624 bearings 32x M4 washers