Paste Extruder Bowden

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).
5 nuts for the threads.
Two 5/16" sliding rods (8mm).
Two linear bearings (5/16 / 8mm).
Ti