E-step calibration ruler
cults3d
a ruler to track the distance of filament travel during e-step/extruder calibration. designed for use with this handy guide i made: https://docs.google.com/spreadsheets/d/1RAfZwq7usYjISnbh2U_zJ1xP8ouG6uLPVZq4wSSqujY/edit#gid=0 use with clear 2mmID PTFE tube like this: https://www.amazon.com/Teflon-tubing-Filament-Printer-Tech/dp/B073RDFTDV and secure the tube in the channel with zipties
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