About this 3D model

Alternate filament guide to my other creation http://www.thingiverse.com/thing:106809 This version is free to move up and down to stop it restricting the feed of filament when the spool reaches a lower level. Tab stops the arm falling below horisontal, and past vertical when used with my quick change spool holder http://www.thingiverse.com/thing:98893. Feed head can independantly rotate so that the head is always at the natural angle of the filament regardless of spool being full or empty.