Filament Funnel

1/4" plastic tube funnel.

This device increases the loading hole from 3 mm to 12 mm.

4/8/2016 UPDATE: I've been using these these for about 9 months now, and for something so small, they are pretty great. I just broke one by pulling the filament sideways instead of down, and reprinting this part just became my highest priority. It's the little things that matter!