HercuStruder

youmagine

I have thoroughly tested both the Airtripper and PlanetCNC variant Bowden Drives, and they perform well, but I wanted to address a few areas for improvement:1.) Easy access to the hobb gear teeth from the rear while filament is loaded or even during printing would be greatly beneficial.2.) The option to drive off a Nema17 motor or a Gear-Reduced Nema17 with a different bolt pattern would provide flexibility.3.) An alternative to push lock tube fittings that would allow the bowden tube to extend beyond its hold point (i.e., pass through the hold-down) is essential.UPDATE: I have abandoned using an 8-32 nut and instead opted for the standard 4mm nut, which others have found effective. Although it's more challenging to thread around the 4mm bowden tube, this setup is less likely to result in the tube coming loose.Available File Types:Zip - A convenient pack-and-go of the full Solidworks 2014 AssemblySTL'sStepAside from the printed parts for the Nema17 version, you will need:1 lot of 4mm OD, 2MM ID teflon tubqty:2 - 4mm Hex Nutqty:4 - M3 Flat Washerqty:2 - M3 Oversized Flat Washerqty:2 - M3x10mm Button Head Screwsqty:2 - M3x12mm Socket Head Screwsqty:2 - M3x35mm Socket Head Screwsqty:2 - M3x50mm Socket Head Screwsqty:2 - Springs (I used McMaster# 9657K283)qty:1 - 608 skate bearingqty:1 - Ultibots 1.75mm Hobb GearIf you opt for the Planetary setup, add:qty:2 - M3x10mm Button Head Screwsqty:2 - M3 Hex Nutqty:1 - Replace the ultibots hobb gear with an 8mm ID hobb gear like the Mini Hyenas gear from Maker's Tool WorksOne note: When threading the 4mm nut around the 4mm bowden tube, it will compress on its ID. Use a small drill bit approximately 2mm in diameter and ream the bowden tube back out in that area.