FilaWinder

This is a much more refined version of my winder for spooling home made filament. The filament drops from the extruder (ideally mounted vertically) and loops back up to the winder. At the bottom of the loop is a row of photocells with a laser shining on them. The photocells track the location of the filament's shadow and modify the speed of the spool to keep it in the same place, usually +/- about 2mm.

The filament passes through a 360 degree loop of PTFE tubing which adds just enough fric