Hi all, I am building a paste extruder based on open source design. However I am having some issues with the stepper motor (NEMA17 Stepper Motors (62 oz) - Model: 1.8° - 1703HS168A ). Video link see the video : It appears that the motor is slipping (skipping?) at the coupler while trying to push the material through. Specs: ACME 8 mm thread >>8mm-5mm coupler>> 5 mm motor shaft I hby mm13360 - Paste Extrusion Working Group