Diagonal wavy arifacts
Hi everyone,
This is not a first print issue, but an issue that has developed with our Core One. All prints, regardless of material, have these diagnoal wavy artefacts on the perimeters. They are easy to see and feel. This print is in Prusament Pritine White PLA. The printer is running 6.4.0 and the model was sliced using the 0.10mm fast detail setting in PrusaSlicer 2.9.4. The print did not complete due to bed adhesion issues, but it still illustrates the artifact problem
Has anyone seen this issue before on the Core One, and what can be done to recitfy it?
Thank you!
RE: Diagonal wavy arifacts
The boat on the right was printed on a MK3 using the same filament and the 0.10 mm detail preset, the quality is much better
I also tried printing cubes on the Core One with a single perimeter, the cube on the left used the 0.2 mm structural profile, and looks under extruded. The cube on the right used the 0.10mm fast detail profile, and looks under extruded, but also has the wavy artefacts again
RE:
Have you done gantry alignment and belt tuning? The more information you provide, the more ideas people might come up with.
Eyeballing the pattern, it could be possible that it's related to one of the two motors (depending on print orientation: One axis ripples, the other axis adds offset, that is, shifts the pattern). If belt tension is ballpark-accurate, maybe check whether the pulleys on the XY stepper motors are still tight on the motor shafts. The flat axle in combination with a slightly loose grub screw could - in theory - cause deterministic slipping / hysteresis that might look like in the picture.
RE: Diagonal wavy arifacts
Yes the belt tension has been checked and gantry aligned several times to both the tigher and looser ends of the belt specification.
The printer has also had the calibrations factory reset, so all self tests and calibrations have been completed again and passed.
And thank you for the suggestion, I will check that next. I have already checked both motor mounts and they are secure
RE: Diagonal wavy arifacts
I have checked both motor pulleys and they are also tight
RE:
Did you check that the pulley are assembled in the correct direction, not upside-down? I remember it was possible to flip them and the printer remained somehow functional. When you move the head in the two diagonal directions (exercising only the X- and the Y-belt one at at time), does head movement in one of the directions feel different? What I'm looking for, given the picture, is one of the belts scraping somewhere with its edge so the tooth pattern shows in the print (note, running the toothed side against round pulleys may seem a little ad-hoc engineering but works in other printers)
Since the keyword didn't show up in the thread yet: You might read up on "VFA"s. For experimenting, you could change print speed (as one root cause is resonance), whether it makes a difference.
You could also check Settings / input shaper and phase stepping, whether they have been changed from the factory preset. My guess is the majority of "active" users calibrates via accelerometer, but the default settings are supposed to work out of the box.
You might open a support ticket, they'll have a more comprehensive catalog of known failure modes.
RE: Diagonal wavy arifacts
Last time I saw something like this here (on these forums), turned out the OP's extruder motor was bad. Best remedy at this point is to get on chat with support and work through this.
RE: Diagonal wavy arifacts
Thank you all!
I will contact support in the new year and post the feedback here!