Problems with PETG print with PLA supports
Printer: Original Prusa XL +Enclosure, 6months old, 5 Tools w/ Bontec HF Nozzles
Material: Prusament PLA & PETG
Hello,
I was printing some PETG containers with PLA supports and after about 15 successful prints, the first layer of PETG started to always print at a too high Z height. Which resulted in very lose/stringy first layers leading to failure. The PLA support layer prints first and is printing fine. The PETG layer is clearly higher than the PLA layer and the Nozzle is even printing about 1mm above the PETG.
It seems to only affect multi material prints. I tried using a different tool which didn't change anything then I tried printing PETG only w/ default settings which worked like usual.
I have tried at lot already with no change in result:
-Calibrating/Testing: XYZ Axis, Dock position, Tool offset, Phase stepping, Input shaper
-delete files and reload them incase of corruption
-Print with slower speed
-Different tools
-Change firmware back to 6.2.0
I have gone out of ideas, I might try to recalibrate again but that's about it.
btw I had 2 minor crashes while a tool was getting parked, it somehow missed the spot. That was 2 prints before the problems started and once while testing. Might be related to the problem or not, I'm just leaving that info here.
The Dropbox link includes the Project file and the bgcode
RE: Problems with PETG print with PLA supports
Update:
I've left my Printer alone for some days.
I recalibrated the tool offset, cleaned out some junk I left at the bottom and changed the firmware back to 6.2.1.
I started a testprint w/ PETG only, which went fine as expected, then I tried printing my PETG container with PLA Support which surprisingly went well, it did crash at the start of the print but after that it printed like normal. It crashed while/after printing the purge line, the toolhead (tool 5) just went to the right and right after the nozzle left the printbed, the printbed moved up, which then triggered the crash detection by touching the heat element.
Right now Im printing the next container which also started fine and with no crash.
It feels like there has been some kind of lose connection, I just have no idea where that could be, or maybe its a bad chip idk.
RE: Problems with PETG print with PLA supports
If you've crashed while trying to dock, I'd double check that your docks are still fully tightened. Might need to recalibrate dock position afterwards.
First post kinda sounds like you have a nozzle or more that isn't fully tightened in the extruder and when calibrating it calculates incorrect [z] values. Won't show problems if used on its own because the bed check will go off it's own readings rather than calculated values. But multi-tool prints will calc things between the tool used for bed leveling and the other tools, so bad calibrations create bad results.
But then I read the second post.
It crashed while/after printing the purge line, the toolhead (tool 5) just went to the right and right after the nozzle left the printbed, the printbed moved up, which then triggered the crash detection by touching the heat element.
Something about this seems very wrong. After purging onto the bed's tab the bed should move down slightly and the tool gets parked. The tool never goes 'off plate' again. The entire tool is above the plate so there's no way for the bed to touch the heatblock. Unless you just meant the bed moved up and crashed into the nozzle. Which is still incorrect in that it went in the wrong/opposite direction that it should. Unless you meant before the purging actually happens, like during the off plate purge. Which maybe falls in line with the loose nozzle theory?
XL-5T, MK3S MMU3 || Printing with multiple nozzle-sizes: Official Guide, Unofficial(old) || PrusaSlicer Fork || Other advanced slicer tactics || TPU || HF Nozzles