Love Schematix dual drive extruder system so I created it in Freecad as a bowden version to be mounted to 2040 rail for my corexy I'm designing. Wanted to help other freecad users by offering something to start with. Using Freecad 17 in Linux. A .app version. Please hack my work and throw it back at me. I put the stl files in for a general idea. My intention is to provide a starting point for freecad users to improve/customize a dual drive system. Don't go printing the stl's. They are for reference only. I did print and test my design as seen in photos. I drove the extruder stepper while pulling on filament to verify strong pull.