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Help with Paste extruder!

Posted by mm13360 
Help with Paste extruder!
July 13, 2017 07:20AM
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!
VDX
Re: Help with Paste extruder!
July 13, 2017 10:40AM
... you'll need more torque - so stronger/bigger motor or gearing.

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 ...


Viktor
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