Bowden style paste extruder

This is a stepper paste extruder in bowden style. It is ment to be used with a silicon tube(6mm OD) and bowden connector(PC6-M6) in the front.

The silicone tube leads to the printhead made out of anything you want(needle, silicone cap..)
The tube that is the main part of the extruder is a PVC pipe(50mm OD and 1.8mm thick walls)
soon to be replaced with food grade INOX pipe of the same size.

Il be making a printing head for the Printrbot simple metal.

BOM:
Printed Parts
1x piston.stl
1x Stepper Mount.stl
1x topmount.stl
1x Gearmotor.stl
1x gearpiston.stl
3x standoff.stl

Other stuff
1x M8 700mm Threaded rod
3x M8 nuts
2x M8 butterfly nuts
3x M3 40mm screws
3x M3 nuts
10x M3 washers
2x 608 bearings
4x M3 10mm screws
1x M4 10mm screw
1x M4 nut
1x rubber o-ring
1x bowden connector PC6-M6
1x 50mm OD PVC pipe(150mm long)

This is still a work in progress and i still did not get a propper o-ring.