I made this to thread filament through for the Ultimaker 2. I needed this because I made this spool holder http://www.thingiverse.com/thing:508896 and couldn't use the arm because I didn't have a guide tube and the filament kept getting caught. So I took off the arm and ran the filament through the new guide. Made on TinkerCad. Edit it online https://www.tinkercad.com/things/fQv4A4vPqBn