V-slot wheel
thingiverse
Sizes: 24 millimeters outer diameter, 16 millimeters inner diameter, 11 millimeters width. You will need two 625zz bearings or similar bearings with a 5x16x5mm dimension. Remixed from https://www.thingiverse.com/thing:611025 This model does not have flat edges; it is round and smooth.
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