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 have increased the amps upto 900 mA from whatever the default was in Prusa i3 Mk2. I also set the extruder steps to M92 E 70 (steps/mm). As you can see i am using a 50 ml syringe with about 25-30 cm tubing (internal diameter 4 mm). Any Ideas what i can do to sort it? I am planning to increase the stepper current further and hopefully results in greater torque to push the material through. Any help/suggestions are deeply appreciated! https://reprap.org/forum/read.php?180,777906,777906#msg-777906 Mon, 17 Aug 2026 22:01:05 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?180,777906,777934#msg-777934 https://reprap.org/forum/read.php?180,777906,777934#msg-777934
Another point with higher viscosity pastes is the gap between nozzle and surface - you can block the flow, if there's not enough room to escape ...]]> VDX Paste Extrusion Working Group Thu, 13 Jul 2017 13:40:32 -0400 https://reprap.org/forum/read.php?180,777906,777906#msg-777906 https://reprap.org/forum/read.php?180,777906,777906#msg-777906
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 have increased the amps upto 900 mA from whatever the default was in Prusa i3 Mk2. I also set the extruder steps to M92 E 70 (steps/mm).

As you can see i am using a 50 ml syringe with about 25-30 cm tubing (internal diameter 4 mm).

Any Ideas what i can do to sort it? I am planning to increase the stepper current further and hopefully results in greater torque to push the material through.

Any help/suggestions are deeply appreciated!]]> mm13360 Paste Extrusion Working Group Thu, 13 Jul 2017 10:20:27 -0400