Very messed up first layers with particular print - Assembly and first prints troubleshooting https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/ Prusa3D Forum Discussion Board en-US Wed, 17 Jun 2026 16:26:16 +0000 wpForo 60 RE: Very messed up first layers with particular print https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719552 Wed, 21 Aug 2024 19:38:40 +0000  

Posted by: @marc-9

Have you done the Tool Offset Calibration? See Step 18 and following https://help.prusa3d.com/guide/5-first-run_482742#483292

Yep, that solved it. I think something must have knocked out the alignment after the initial calibration, then my second go the nozzles probably weren't properly clean. Heating each head up to 250 for five minutes then cleaning and recalibrating got it working nicely.

]]> Assembly and first prints troubleshooting Jake https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719552 RE: https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719512 Wed, 21 Aug 2024 08:40:34 +0000 Have you done the Tool Offset Calibration? See Step 18 and following https://help.prusa3d.com/guide/5-first-run_482742#483292

]]> Assembly and first prints troubleshooting Marc https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719512 RE: Very messed up first layers with particular print https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719419 Tue, 20 Aug 2024 09:31:55 +0000 Small update: disabling phase stepping helped a lot with the gaps, but it still seems to try and print into the same layer or lower causing collisions:

 

First few layers with phase stepping disabled

 

Could it be an issue with z calibration across different extruders?

]]> Assembly and first prints troubleshooting Jake https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719419 Very messed up first layers with particular print https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719385 Tue, 20 Aug 2024 01:00:39 +0000 I just got my XL yesterday, did a test print that came out great, then designed something to test out printing with all 5 extruders. I've spent all day fiddling with  PrusaSlicer and the printer and I just can't get it to print. Here's the first and second layer on my 10th failure:

First and second layer after another print failure

I can't figure it out. The issue in the last few has been a first and second layer that look like that, then the third layer collides with the second. I did another test print (a disc a few layers thick) using just that particular extruder and PLA and the result was perfect, which is why I'm so confused:
Test print first layer
I've pretty much stuck to the default slicer presets (I've tried a couple) and I don't think there's anything particularly unusual about the model:

Cute little lime guyFirst 2 layers by feature typeFirst two layers by colour (all same colour)

Any ideas? Thanks

]]> Assembly and first prints troubleshooting Jake https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/very-messed-up-first-layers-with-particular-print/#post-719385