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Posts posted by MJJ56
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The answer of DaHai8 pushed me towards the A4988. I think (but I can't find a description) that the A4988 reverses the direction if the maximum current is reached.
I tried the following. Printed a object (small cube) with the maximum current for the E of 1300mA. Result: no problems, no retractions, just fine.
Then I lowered the E current to 900mA. With the same g-code: problems, sometimes a rectraction.
So I agree with DaHai8.
There's not really a piece of code in the Marlin Firmware that does retractions. You won't find a 'retract filament' method or subroutine.
If I read the datasheet of the A4988 well overheating or maximum current result in the same behavior??
As I said before changing the PTFE coupler had a great positive impact. I even programmed a PTFE used timer in the Marlin firmware, so I know how long I'm using the coupler.
What I dislike most is the fact that I don't know that is "skipping" happened, since I don't stay with the printer all the time
So DaHai8, sorry, yours answers meant a lot!!
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DaHai8,
I totally disagree your with your answer. There is NO retraction in the the g-code. Even when the first layer is printed there is a sometimes a retraction. Sometimes printing the brim. See https://ultimaker.com/en/community/16596-retraction-issue
there is a video example I found today.
If I lower the maximum E-current from 1300mA to a lower value (1000mA) then this retract is far more often. So my conclusion is that the Marlin firmware does this.
So your hope that this helps is: NO.
My hope is now that you agree with me and/or someone else can help. Anyway thanks for your time and answer though.
Regards Jaap.
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Hi,
When I print a model sometimes there is a unwanted retraction (even when retraction is NOT enabled). There is no reason for the retraction, printing is going very well at that point. My question is: what triggers the retraction. Second: where can I find the code in the Marlin firmware that perform the retraction?
I changed the PTFE coupler some weeks ago and I must say the above described perfomance is not noticed anymore. But I wat to know if it happened during a print, because at that point the print is obviously weak.
Thanks for an answer,
Jaap.
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Hi,
Changed my version 2.1.1 board today with the electronics used in de the 2.1.4 version. Now I have a silent Ultimaker 2 while not printing!
Changed the firmware:
Fan on at 40C (EXTRUDER_AUTO_FAN_TEMPERATURE) and turn off at 35C. Otherwise at cooldown around 40C fan goes off and on. Now a hysteresis.....
See you,
Jaap.
Filament Motor Skipping noise
in UltiMaker 3D printers
Posted
Search on the forum for "Skipping"
https://ultimaker.com/search?search=skipping
There are a lot of answers you probable detect a solution.
I have the same problems and I think it is a hardware issue in the stepper motor driver chip A4988.
I think (but I can't find a description) that the A4988 reverses the direction if the maximum current is reached.
I tried the following. Printed a object (small cube) with the maximum current for the E of 1300mA. Result: no problems, no retractions, just fine.
Then I lowered the E current to 900mA. With the same g-code: problems, sometimes a rectraction.
I great improvement was a new PTFE coupler, skipping was much less but still sometimes skipping. What I dislike most is the fact that I don't know that is "skipping" happened, since I don't stay with the printer all the time
Succes, Jaap.