Extruder e-step Calibration Fixture

This is a simple to make device that makes calibrating your extruder's E-steps a snap. It can be used on direct drive extruders, extruders with a Bowden tube and even remote direct drive extruders, You just need to have access to the top of the extruder where the filament feeds in. The results are very reproducible. The heart of the tool is an inexpensive digital caliper. I prefer the lightweight plastic/CF calipers. You can get them at Amazon in the US: https://www.amazon.com/dp/B01LW1V1B1/ref=