Help!!! Awful wavy surface to prints!



  • Around 6 months ago I started on the adventure of building my own printer. I ended up buying a kit that I could then modify as I learned more and more. After a strong couple days I got a printer that printed pretty well besides leveling issues that was more my fault then the machines fault. I had been using the included mother board until something happened with the motor controller chip that ended up sending to much electricity into the motor causing it to overheat and loose steps. So in a leap of faith I splurged and got the Duet 2 WiFi. After setting things up and many hours of troubleshooting, I got it up and printing. Although for some inexplicable reason it will now after the change print with a wavy surface. It sorta looks like ghosting that I get on some of my other machines, but all over the print regardless of edges or anything nearby.

    Here’s a few images to get a idea of what the prints look like.

    377AA8BA-3418-4D28-9801-7E15730F25B3.jpeg
    0BF8B905-C21C-4584-B396-D58F416648E2.jpeg 3A76E257-6369-4827-83A1-132302C77AC6.jpeg

    I have spent countless hours trying to get this to look better, but with absolutely no improvement. I need help with any ideas of what I can do to get a better look to my prints. Be it in the slicer or in the config files for the Duet.

    Printer is a Core XY printer and I use S3D as my slicer.

    Thanks



  • @Machoo566

    You apear to have at least two issues. There seems to be a coarse and a fine pitch wobble. Check the pitch on the coarse pitch and see if it matches your belt. Toothed belts running over smooth idlers on core xy are a common cause. Next are poor quality belts or pulleys and or idlers.

    Tackle the fine pitch after nailing the coarse. It may disapate a little when there is less vibrations in the system. If not read up on the Dynamic Acceleration Adjustment. I've not used it as it came after I lost access to a Duet 2.

    https://duet3d.dozuki.com/Wiki/Gcode#Section_M593_Configure_Dynamic_Acceleration_Adjustment


  • Moderator

    The consistency of the ripples definitely hint at it being a mechanical issue. Something seems loose, or worn out.



  • @DocTrucker Thank you so much for the advice! Although I’m still kinda new to things like coarse and fine pitch. So if you don’t mind explaining or maybe giving a link to somewhere I can understand what you meant by checking the pitch and see if it matches? I just want to be sure I’m checking the right thing. Thank you again!



  • I may have been slightly premature with the course and fine as one picture is much closer zoom - it was late at night! 😄

    That said measure from high point to high point from one wave to the other (wavelength) of the vertical pattern on the fin. Measure along one layer and try to pick the pattern that isn't a ghost of the edge of the part.

    The latter is likely to be the Jerk is too high, but could also be a loose belt. I've found if the four pillars of the the benchy part (search benchy3D if you're not sure what I mean) are looking very poor that can often be a sight of low tension on the belts.

    I'm going through this sequence at the moment with my machines!


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