Bowden extruder mount for RigidBot

thingiverse

This attaches the standard RigidBot extruder to 20mm bars, with a threaded hole fitting snugly into a 1/8" BSPT bowden coupling (10mm threads). The coupling I've chosen is identical to one provided by E3D for their v6 hot-end. I've included a DesignSpark Mechanical drawing you can modify to suit your needs - and it's free, courtesy of RS Components. The pictures here show an upgraded v1 design I've never officially released, so note that they showcase a few minor improvements not reflected in the initial print. Parts: - 2 x 6-32 screws at least 0.5 inches long or equivalent metric - 2 x 6-32 washers - 2 x 6-32 hex nuts - 2 x M3 25mm screws for attaching a NEMA17 motor Print the top and bottom components with layer thickness set to 0.2mm or higher. PLA should be fine, though some prints may exhibit slightly poorer surface quality if settings aren't ideal - I personally made this mistake on mine but it holds well. Bowden Coupler: Smooth any major ridges from the threaded hole using pliers, then carefully insert a small instrument (e.g., an old credit card or similar thin piece) into the hole to smooth off more significant irregularities. Prepare your E3D-provided plastic coupling and preheat a soldering iron while keeping it poised ready for action. When both components are primed and prepared, hold the Bowden hole open using one hand and carefully slide the hot end of the soldering iron upwards along the opening - without touching either side or the top edge. Hold the hot tool within 8 to 12 seconds. With softening metal ready in your workpiece, proceed swiftly to fasten both halves firmly into place. To connect everything securely on the RigidBot side, place a 20mm bar over it then position and attach two components carefully; note you may have to grind out any unwanted support structures preventing them fitting flush initially. Press hex nuts onto bottom half & tighten from above by screwing down while simultaneously attaching those tiny M3 screws tightly