Bowden Adapter with hidden nut

thingiverse

These instructions detail how to print the nut chamber and insert the nut in your 3mm filament tube without drilling a hole, which may create PTFE dust that could clog your nozzle. Firstly, follow the print instructions given by processing the STL file with your preferred slicer, opening the GCODE file, and adding specific G-codes to allow time for nut insertion. After printing, wait for the printhead to move away from the part before inserting the nut into the chamber as the plastic is still hot and soft. Then, continue printing and enjoy the result. For assembly, use a 3mm hex wrench to push and turn the PTFE tube into the adapter, screw it into the nut, and remove the hex wrench. Congratulations, your nut is now securely in place!