Filament Extrusion Measurement Rig

This is a device to be used before your extruder that makes it easier to straight, mark and measure with a caliper in order to check and calibrate your extrusion steps/mm.

Update:

Now there is a hole to put a piece or lenght of 4mm OD PTFE tube and better clearance for the filament. Also two versions with 100mm and 125mm gap!