Paste Extruder Bowden

thingiverse

Here's my latest design of it. I kept having trouble with the original designs, so I just sort of remade it completely from scratch. So I guess it's not really a remix anymore, but I posted the sources anyway since they were used for inspiration and helped me settle on my design. I still haven't tested it yet - still trying to print it - so I can't guarantee it works yet. It's currently a direct drive extruder where the stepper plate will slide in as it pushes the piston down the PVC pipe. You can't see it from the picture, but there is a nut inside on the back plate - that's why the piston goes in as the stepper turns. The front needs a Bowden connector, PTFE tube and bowden connector, then a nozzle. 1-1/2" PVC pipe - like 8 inches long or so. 38mm o-ring. (Home Depot had some water faucet type that were the right size for about $2.50). Three all-threads that are 5/16" (8mm). Five nuts for the threads. Two 5/16" sliding rods (8mm). Two linear bearings (5/16 / 8mm). Tie wraps to attach the linear bearings. Nema17 stepper motor. Shaft coupler PTFE tube (4mm ID, 6MM OD, like 0.5m or 1m length) Bowden connectors (6mm - for 3mm filament) You may need to resize the piston based on the inside diameter of your PVC pipe since some have thick walls and others have thinner walls.