A PTFE liner is inexpensive and will work fine with the aluminum wire. If you want to do normal welding later, you’ll need to put the original liner back in. The other thing you’ll need is ...

[Dominik Meffert] has done exactly this with his wire 3D printer project. Extruder cold end using a standard feeder roller For his filament, [Dominik] chose standard welding wire, and has also ...