I knew the design was faulty, but it got me thinking about how to make a functional wheel for the Modio/Thingmaker parts. It is essentially it's own bearing, with two parts printed together. I added tiny supports across the center piece to the exterior to prevent the parts from being pulled off the print bed. They just need to be cut or broken to free the wheel.
XYZ Da Vinci 1.0
I printed four of these at 15% infill and 35mm/s.
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