Spool Spindle

This is a filament spool spindle designed to reduce the torque necessary to unspool filament while printing (on a Prusa i3 with 7mm threaded rod spool holder, or any other similar printer) -- give it a shot if you're having under-extrusion issues.

The dimensions were based on Hatchbox spools, but you can easily scale to other dimensions.

As designed, I printed two short pieces for each side of the filament spool. I also included one long solid spindle if you'd rather have a single piece.