4 mm to 5 mm motor shaft / axle adapter
thingiverse
I craft robots and discover that the majority of dc motors feature 4mm shafts, yet most standard available 3D printed pulleys and gears boast 5mm diameters. This discrepancy prompted me to seek out an adapter capable of linking a 4mm shaft to a 5mm axle, but my search yielded nothing. Consequently, I made the decision to design a custom solution myself.
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