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Thanks for this design! I made one, but rather than search for mk8 gears with shallow enough groves, I did a mk8 gear, and then a 36tooth 11mm gear on the other side. https://www.amazon.com/gp/product/B01J5ON2Y2/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1. I should probably change the gear ratio on this side since the 11mm gear has a larger radius, but seems to work pretty well.