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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.
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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.
Link to post
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