Geared extruder v.2

Update 04/26/2016: I will not modify this design anymore, there is a STEP file attached, feel free to alter the way you like. Update 02/09/2015: Refreshed all stl files to match latest CAD file. Older stl files removed, use DS Mechanical to open older source files if needed... Update 28/08/2015: Now tested with TPE (flexible filament). Uploaded new DS Mechanical file (v12) with new gears, if you are using old ones - leave it as is... Update 28/07/2015: Left a bit more space for idler bearing, still there is a small chance that you'll need to cut some plastic during assembly to get a good grip. Easy filament change quick release geared bowden extruder. Just push the idler arm and pull filament outside, then insert new one and release. That's it! Gear ratio is 1:3.54, for 1/4 microstepping and 1.8 degrees stepper it's 150 steps/mm. Vitamins needed: * 6x 10mm M3 allen head bolts * 2x 30mm M3 allen head bolts * 4x M3 hex nuts * 1x 50mm M5 hex head bolt