My Experience with Relative extrusion (Problem and Solution)
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@dc42 said in My Experience with Relative extrusion (Problem and Solution):
I can confirm that the code was not working as intended. I have implemented a provisional fix, and subject to testing that will be included in the 2.02 firmware release.
Meanwhile, I suggest choosing extruder microstepping so that the number of microsteps/mm is in the 400 to 1000 range.
Can you elaborate on what behaviour was intended, what was actually happening, and how the behaviour will be now that it's fixed?
Thanks!
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@MegaAndy, Thank you for bringing this up, I have been trying for months to remove an issue with blobbing(or zitz). I've tried everything I could think of, and I tried everything others suggested. But I could not get rid of my problem. Then I changed my microstepping from 16 to 128, and the problem went almost away. I still have to do some tuning, but so far I am liking the results.
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I read on the https://reprap.org/wiki/Duet the following: "Microstepping is locked to 1/16. Board throughput is always sufficient to handle it, including on 0.9° steppers.". So, I guess upping microsteps is not possible for "us" who are using 0.6 and 0.85 boards. Changing to 0.9 degree stepper could work, but I understand that they have less torque. So changing to a geared extruder might be advisable?
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@deltacon The question is: how much torque do you need? Torque primarily has an influence on maximum acceleration. And even then it might surprise you how few of a torque is required for certain accelerations.
You could use my Maximum Acceleration Calculator to find out.
P.S.: On the other hand 0.9° steppers have higher back EMF so you would probably get lower maximum speed.
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@MegaAndy thank you! This is great idea! Today I will test it.
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