An easy to use tool to move filament between two spools. Don't waste a kilo of your filament on something you'll probably never use. No extra parts needed to complete the print, just hook it up to a drill and have something to hold your bad spool like your external spool adapter on your machine and just crank away, don't go too fast. I use reverse and just move the tool left and right to make the filament go back and forth.

v2 Update: Trimmed and oriented models for stronger bonds and easiest printing. No supports or brim needed, brim is enabled for profile acceptance purposes, but you can turn it off if you have good adhesion like with a cold plate. With 4 walls and 15% infill models are 93g.

Version 1 available here.