Anet A8 Filament Extruder Release

This replaces the Anet A8's extruder lock with one that is a bit more comfortable to use, than pushing on a screw. It is, for the most part, modelled after the original, but with a few changes. The internal mechanics are the same, however; the filament hole has a gradual narrowing rather than the step in the original, the spring is held in place by geometry, and there is a push knob which threads into the main block in place of a screw.

My intent was to re-purpose the nut from the original