[Concept] Nutty drive
The driving mechanism that pushes the thermoplasts or metals through the heater chamber (for making them liquid) is a very critical one. It needs to push the plastic with a strong and reliable grip. A threaded scew, coach bolt, worm-wheel and pinch wheel versions have been made. This is another concept, using a nut instead of a thread, inspired by Forrest’s idea (see here).
The primary gears should be laser cut or milled. The sub-assemblies should be stacked, rotated 120′ degrees axially (for 3) or 180′ degrees (for two). Of course the actual design should be refined and needs more parts. But I’d first like to have some reactions and critique 🙂