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Redpiperbob
(@redpiperbob)
Active Member
MK2.5 extuder problem

Hi there

I hope someone can help me I have a Prusa I3 MK2 that I upgraded to 2S then 2.5 back in 2018

The machine has worked fine until yesterday when the Extruder started to oscillate a step forward and then back a step. I took out the filament and released the pressure on the extruder motor so it was running free. Still had the oscillating. So I swapped the wiring on the main board so that the Extruder motor was plugged into the X socket on the main board. And the motor turns OK when advancing the X axis. I then plugged the X motor into the Extruder socket on the main board and used the extruder advance in the screen and the motor turned OK. I then swapped back the wiring to the original sockets and the Extruder started to oscillate again. Can some one help please.

Thanks in advance

Bob

Posted : 28/01/2022 12:06 pm
Bob
 Bob
(@bob-2)
Reputable Member
RE: MK2.5 extuder problem

Can you get a video of it?  I'm not sure if you're talking the extruder or the print head.  I'm not sure how an extruder can oscillate.

Cheers

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit

Posted : 28/01/2022 11:56 pm
Redpiperbob
(@redpiperbob)
Active Member
Topic starter answered:
RE: MK2.5 extuder problem

Hi Bob

I could not find how to load avideo. So I have put it on youtube. Here is a link.

 

Thanks

Bob

Posted : 29/01/2022 10:56 am
Bob
 Bob
(@bob-2)
Reputable Member
RE: MK2.5 extuder problem

Thank you for the video, I now understand.  So, to summerize, the extruder works fine when plugged into the X-Axis driver and the X-Axis motor works fine when plugged into the extruder driver.

This is a puzzler.  The only thing I can think of, and this may be dead wrong, but it's the only thing I can is maybe the VREF on the extruder driver is a little too low.  It's high enough for the X-Axis servo but no longer high enough for the Extruder servo.  I've never adjusted VREF on a Prusa so I'm not going to try and advise other than suggest you take this up with Prusa support.

Cheers

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit

Posted : 29/01/2022 7:05 pm
Redpiperbob
(@redpiperbob)
Active Member
Topic starter answered:
RE: MK2.5 extuder problem

OK thanks Bob

Bob

Posted : 30/01/2022 10:05 am
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