Frame-Mounted Dual Bowden Extruder (Prusa i3)

thingiverse

When I upgraded my Prusa i3 to have dual extrusion, I aimed to keep the extruder motors statically mounted so as not to strain the hot-end carriage. To achieve this goal, I decided to mount them on top of the printer's frame at a 45-degree angle above the horizontal, thus maximizing the radius of curvature of the PTFE tubing and reducing changes in curvature - essentially keeping the tube relatively straight down when the motors are mounted at 45 degrees. Note that the mount does not physically attach to the printer's frame but rather sits on top of it, staying securely in place due to the clip-like shape of the mount. I utilized M3x14 screws, M3 washers, and M3 locknuts to assemble the mount and also to secure the motor brackets to the mount.