Solid 65mm wheel
thingiverse
I created this object purely for entertainment purposes. It incorporates one of my earlier bearing designs found at https://www.thingiverse.com/thing:2783252, which demands twenty-two 4.5mm steel balls - you can find the instructions on that page. To enhance grip, I recommend wrapping a section of bicycle hose around the wheel and stretching it into place. This design can withstand several kilograms of weight without issue.
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