Starting with a standard model of a hub that fit over the drive shaft of the stepper motor I 3D printed two iterations of bearings and my team and I printed Two iterations of Wheels. We nearly had correct bearing sizes with our first prints but they came out just a little to small, fortunately we were able to nail the sizing on the second print by adjusting for the margin observed in the first print. The design of the hub was very straight forward, it was just an extruded cylinder with a hole shaped like the shaft of the stepper motor, which is like a circle with the top and bottom planed flat. The wheel design was also very straight forward, my team decided to try and design a hole in the wheel that would slide right onto our hub and hold itself on with friction. This took the exact same process as fitting the bearing took, just making a print and measuring and reprinting to account for the margin of error. So we printed a small wheel first just to test the sizing and were able to adjust for our final print of our wheel. My partners had the idea to put a lip in the outside surface of the final wheel so it could be filled with hot glue to give our final robot more traction. We also cut more material out of the test wheel to speed up the printing process slightly.
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