Lack Enclosure Reverse-Bowden pass-through

thingiverse

I've been using this adapter for months with my Prusa Mk3 and extended Lack enclosure, which I've improved upon by sharing my own parts soon. This adapter allows for a smooth pass-through of filament from outside the enclosure to a reverse-bowden tube, preventing unspooling and sudden tension changes on direct-drive extruders. Recently, I uploaded version 2 of this adapter with an M6x1 thread for coupling the two parts together, rather than relying on friction fit into the enclosure. To print the threaded long tube, I recommend using a brim for stability and printing it slow with a max layer height of 0.2mm on both parts. The unthreaded parts are still available for those who struggle to print the threads. For the inside part with the thread, print at no greater than 0.2mm layer height. To assemble, simply screw in a PC4-M6 tube adapter and drill a hole all the way through the top surface of the enclosure using a 1/4-in or 6.5mm drill bit from the top down. Ensure the printer is not inside to avoid dust and debris issues. Once the main hole is complete, open up the interior hole on the enclosure to 8mm or 5/16-in. Then, attach a PTFE tube into the adapter and onto the reverse-bowden adapter for your printer. Make sure the tube is just long enough for the lowest side positions the extruder can move to. To use, simply feed filament from the top of the enclosure, which should flow straight into the reverse-bowden tube. Remember to disconnect the reverse-bowden tube when unloading filament to prevent it getting stuck in the tube.