I was tweaking my Filament Funnel for Frustration-Free Feeding (6F) when I realized that I'd designed the thing to fit my own filament tubes with my own filament, and wouldn't work with other tube or filament diameters. Since I designed it in OpenSCAD anyway, I figured I'd just upload it and let you change whatever you want. This is my first time trying to do this, so let me know what you think.
This is a guide to make it much easier to load filament into tiny holes in tubes. One end slips over the tube, and the other has a sloped funnel that leads the filament into its hole. My eyesight and digital dexterity aren't so good, and my filament holders face a wall. I had to stand bent awkwardly to get the end of the filament near the hole, and I used to scream in frustration after the tenth failed attempt to jam the damned thing in. More often that not a failure would mean dropped filament snapping back around the spool. What a pain in the ass! The 6F has made my life so much easier. I hope it's useful to others as well.