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Daranbalt4

Geeetech extruder idler arm

by Daranbalt4 Mar 17, 2019
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Glad you made this :) works

Hi,

nice and clean design! :) The Extruder on my A20M is making a horrible squeaking noise while retraction. Do you know this problem? Do you know/think your design will eliminate the noise?

Hi,
Thx :D yes, my A10M make the same. It's because the extruder can't feed faster than 40 mm/s. If you set this in software, and you set the correct motor current, then the noise will disappear.

could you please tell me correct motor current? I lowered the retraction speed from 60 to 45 but the noise didnt disapear. I will try 40 and lower then but I am interested in the correct current.

I set the Vref to 1.020 V with the original A4988 drivers, with R200 resistors.

Thanks a lot! I use TMC2208 and will try this...

With TMC2208, you should use Vref about 0.7-0.8V. (I use these Vref with my Geeetech Prusa I3 with TMC2208)