6801 Ball Bearing
thingiverse
The GM17 gear motor pairs well with this sturdy bearing, which requires trimming its knob prior to assembly. For a bamboo design cut through 5.2mm layers, this 5mm wide and $30 for 10 piece offers a precise fit due to its 12mm inside diameter, accommodating the GM17 shaft. The OpenSCAD model is in English units; it could be helpful for your project.
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