Extruder Filament Feed Calibration Ruler
thingiverse
A ruler designed to mark the filament at 15 cm before feeding and reading off the actual length fed afterwards. The filament snaps into the bottom and top of the ruler and fits into the grove to make reading off the length easier. The length of the ruler is 15 cm with a ledge at the top that can be used as a guide for a sharp razor mark or marker line. The markings on the ruler are in mm of actual fed filament to be read off where the mark lines up after feeding 10 cm of filament through the extruder.
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