Problems with "wave pattern" in printing on the HEVO
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What steppers did you choose?
Looks like VFA (vertical fine artefacts) to me. -
Maybe M204 is wrong, with P 500000 etc. (I expect you wanted to use dot instead of comma)
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I use this stepper for X and Y "Nema 17 45Ncm 2A"
and for Z I use "Nema 17 59Ncm 2A"
I wrote the P500000 with a dot. Is it correct that way?
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@Patrick_487 With dots it's ok then.
Maybe https://forum.duet3d.com/topic/5319/strange-ringing-artifacts-on-corexy helps you, if Hevo means Hypercube Evolution. Looks similar.
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@Patrick_487 A while back I saw someone with a similar issue whom increased his stepper currents and that seemed to help a considerable amount.
He started at 800, and went to 1600 for reference.
-Tim -
This is a wild guess but could resolution of the extruder cause a little hump when it extrudes and a little valley while it is waiting for the next step of the extruder ?
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@jens55 said in Problems with "wave pattern" in printing on the HEVO:
This is a wild guess but could resolution of the extruder cause a little hump when it extrudes and a little valley while it is waiting for the next step of the extruder ?
This can be determined by printing with a different layer height and observing if the pattern pitch changed.
I would also try to print it rotated by 45deg to see if it's an interaction between the two x/y motors (with diagonal lines, only of of the motor is turning).
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see my post about the same issue.
https://forum.duet3d.com/topic/9438/artefacts-on-wallsswitching to 0.9 degree steppers made it acceptable for me.
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I have now tested 1400mA for X and Y, but with no visible changes. The upper part has been printed at 1400 mA, the lower one is printed at 1000 mA.
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Possibly similar issue on my modded HEVO: https://forum.duet3d.com/topic/8213/ringing-at-20-70mm-s-mostly-during-acceleration-deceleration
I didn't update the original post, but what I've found is this:
- Since two motors work in tandem, they probably tend to vibrate (reach resonance) more often than other printer geometries.
- The resonance might appear like ghosting due to high jerk, but it's suspiciously consistent, usually at around one full step in amplitude (e.g. 0.2mm - amplitude not distance peak to peak - for HEVO 1.8 deg ).
- Loose or bad components on the axes may increase the vibration.
- 0.9 steppers help but not eliminate it.
- Normal to slow speeds are worst, 60mm/s being worst and above 90mm/s being better and 120mm/s or more being best.
It would be interesting to see if any of this applies to your HEVO...
