Paste extruder adaptation for 50ml syringe

This is a paste extruder made for 50ml luer lock syringes. http://www.mdpi.com/2227-7080/5/3/50

Hardware:
1x 50ml luer lock syringe (31mm OD, 29mm ID) + blunt tip luer needles

1x Nema17 motor
2x 608 bearings 8x22x7
1x M8 threaded rod 150mm long
1x M8 nut
4x M4x40 screws + nuts
2x M3x16 screws + nuts

4x M4 screws for mounting

Cut syringe plunger off and glue 3D printed part to it, then thread the M8 rod through it. M8 nut fits in the bigger gear, and is sandwiched between the