My fingers were getting sore winding the extruder gear back and forth when changing filament, so I made this which is a 'handle' that fits into the gaps in the extruder gear. This makes winding quicker! You could of course print the whole gear again with a handle on it but I have found printing gears can be quite tricky. So I made this. The tolerances are quite tight though, so I included the original scad source for tweaking purposes.