Inconsistent Extrusion?
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@petrzmax yes I'm using Capricorn tubing in fact. I recently replaced my single-drive extruder with dual drive, and replaced the bowden tube at the same time because the one I was using before was so short that when the print carriage was in certain regions of the build plate I got very tight radius curves, which causes other problems. When I replaced the tube I went deliberately long, with the plan to cut it down a little after I've got some other things taken care of. I think I can cut down the tube by a good 100-200mm without getting too-small curve radius, since I also re-oriented the tubing a little. Hopefully when I cut the tubing down my bowden problems will reduce a little. Btw, I just had to stop a print of this wing panel and start a new one. I thought that the 0.25 pressure advance had solved my problem, but the problem was back. It's a combination of factors. What I'm seeing specifically is this single-walled print having underextrusion in the first few centimeters after the start of a new layer, leading to the layers in that region being incomplete. It's not a problem I see in my solid prints, but these single-wall complicated sparse parts are really tough to print well.
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This is a stab in the dark, but can you please try setting
M566 P1? This sets the jerk policy to mimic a more Marlin like way of doing things, that applies the jerk value to more move types. At least that's my understanding.I assume you're running firmware 2.03.
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@sethipus said in Inconsistent Extrusion?:
Good luck with your rebuild. Note that 0.4 is a very high value for pressure advance. If you read this Duet FAQ article on pressure advance it says that moderate bowden systems might use 0.1, long bowden systems using 0.2, and direct systems as little as 0.05. Have you testing with settings in the 0.05-0.2 range?
You do know the values on the wiki are too conservative right? This has been stated very often.
For example, for my 100mm Bowden volcano for ABS i need about 0.25, and for the same thing in PC i need 0.68
I suggest you tune the values according to this thread, not what the wiki states for some empirical values.
https://forum.duet3d.com/topic/6698/pressure-advance-calibration -
@phaedrux I'm using this command M566 P1. Models on photo were printed with this setting. Sure I'm on 2.03
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In that case, have you tried with M566 P0?
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@phaedrux Yeah, it was main setting at the beginning.
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Which slicer are you using?
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@phaedrux Idea Maker. But I was trying also Cura and S3D. Every slicer produced similar problems.
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Hi again!
The parts have come yesterday and I have rebuilded and recalibrated my extruder. Also, I have switched to relative extrusion and x128 microstepping which I think helped a bit. Here are the results:
As You can see its much better and almost perfect. Almost, because now new lines have appeared. From my research I know that it's related to stepper settings. Changing TBL and TOFF had impact on this pattern. The question is does somebody made this lines disappear on TMC2660? I know that on prusa printers they can modify stepper waveform to make it disappear, but is there a fix for us, Duet users? I'm already on 0.9 deg motor with titan Aero.
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@petrzmax said in Inconsistent Extrusion?:
Hi again!
The parts have come yesterday and I have rebuilded and recalibrated my extruder.
As You can see its much better and almost perfect. Almost, because now new lines have appeared. From my research I know that it's related to stepper settings. Changing TBL and TOFF had impact on this pattern. The question is does somebody made this lines disappear on TMC2660? I know that on prusa printers they can modify stepper waveform to make it disappear, but is there a fix for us, Duet users? I'm already on 0.9 deg motor with titan Aero.
I would try increasing or decreasing the stepper current a bit and see if that helps. You could also try to play a bit with the voltage regulator on your power supply , that changes the magnetic fields to be less ... interfering maybe and maybe gets rid of it.
Can you explain what you did when when you rebuilt the extruder? I´m chasing similar inconsistent extrusion problems to what you had before.
