FLSUN i3 Extruder

The extruder that came with my FLSUN i3 Plus did not have the filament hole in a location to feed straight through the gear, so it was very difficult to load. This resolves that problem and also makes to gaps minimal so it should work with flexible filament (not tested yet).

Designed to use the extruder hardware that comes with the printer kit. No additional hardware needed.

Edit: Added idler arm v17 with a 1mm shorter spindle (less play in the bearing) and make the arm a bit longer (eas