Extrusion ruler

Extrusion ruler

thingiverse

I designed this because I'm lazy and I don't want to use my caliper to measure 120mm to calibrate my extrusion. It is designed to insert the ptfe tube with the filament at the bottom then you can you a sharpie to add 2 mark to measure the extrusion. I printed it the numbers facing down. note: the holes are useless! :P

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