Extruder Calibration Ruler

This is a small ruler I made to help with calibrating my extruder steps/mm. It has a slot which you can snap the filament into to get a nice straight and accurate measurement. It is 120mm long to allow a little extra in case you think you might be over-extruding. The filament is a fairly tight fit but that means the ruler won't move or slip and it keeps the filament straight. There are two models. One for 1.75mm filament, and one for 2.85mm. Originally uploaded to Thingiverse in 2016, but now expanding to other platforms.