Comment on First mm always faulty?

• Excrubulent@slrpnk.net ⁨7⁩ ⁨months⁩ ago

  In the second photo if the fully printed part it’s hard to see the issue.

  Looking at that first layer, the first tooth looks very similar to the internal perimeters of the teeth that have had two perimeters printed.

  Is it possible the first pass on the first tooth is printing an interior perimeter whereas the first path on the other teeth is printing a different perimeter? What does the first layer look like when you let it finish the layer?

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  • PixeIOrange@feddit.de ⁨7⁩ ⁨months⁩ ago

    In the first photo the outter perimeters were completely print and the inner started to print. The outer perimeter from the first tooth is missing, so theres only the inner one. In PrusaSlicer the perimeters are correct, the nozzle moves correctly but no filament is coming out. It begins with the second tooth. I let the nozzle draw 5 lines prior to the printing so the pressure in the hot end is correct. I guess its a retraction issue, maybe the slicer retraction settings are ignored by the firmware, ill look into that tomorrow.

    Anyways, here a picture of the first layer:

    failed_gear

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    • Excrubulent@slrpnk.net ⁨7⁩ ⁨months⁩ ago

      Okay, thanks. I’m afraid I don’t have any further insight here, there’s obviously either a problem with the G-code or how the printer is executing that G-code. Could you provide the G-code file? I don’t know if I will be able to get much out of it, but there are a number of G-code viewers and simulators that can help you understand better what’s going on.

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      • PixeIOrange@feddit.de ⁨7⁩ ⁨months⁩ ago

        Thanks for your offer. I tried cura slicer and there the problem is gone. So it is a problem in PrusaSlicer. Here is the gcode, please dont put too much effort into it.

        filetransfer.io/data-package/i7JoxlFl#link

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    • MeanEYE@lemmy.world ⁨7⁩ ⁨months⁩ ago

      It’s a retraction issue. If the layer starts there and you are missing first few millimeters of filament, that means you’ve retracted filament too much. If it’s only on the first layer, adding skirt will help prime the nozzle. But if it’s present throughout the entire print and all the layers start there, which it seems to be the case, it’s retraction issue.

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