Extruder calibration ruler
thingiverse
Extruder calibration ruler for FDM 3D Printers. Handy tool for precise extrusion calibration of your FDM 3D Printer. You can find many videos and articles about that process by "extruder calibration" search. As an exaple here is description of the process: https://all3dp.com/2/extruder-calibration-6-easy-steps-2/ Happy printing!
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