Dickbutt extrusion visualizer
thingiverse
Just like these: https://www.prusaprinters.org/visualize-extruder-motor-movements/ Only better! Just glue a little magnet to the back, and attach it to your motor! Dickbutt courtesy of timfou (https://www.thingiverse.com/thing:2177280)
Download Model from thingiverse
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