Filament Calibration Jig

Just as every programming student has their own "Hello World" executable, all makers have their own filament calibration jig. This one is mine.

Small, simple, functional. Measures filament draw from the inlet of the extruder using a rigid interface, to reduce hysteresis effects. Accurate results are best obtained by supplying some resistance to the filament coming off the spool, as lash is real and can throw things off by anywhere from half to several millimeters. A hand resting on the sp