Why does my first layer look so scratchy?

Bambu Lab A1 Series Troubleshooting
1

It’s been doing this for a while. I thought it was my nozzle or filament dry levels but just got a new one and a filament dryer and its still doing it… It didn’t used to do this on the same settings
Slicer: Bambu
Model: Bambu A1
Filament: Jayo PETG White
Nozzle: 0.4 Hardened Steel
Nozzle Temp: 255 Initial / 265 Other
Bed Temp: Initial 80 / Other 75
Print Speed: Initial 50 / Initial Infill 105 / Solid Infill 250

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2

I had a similar problem once when I was printing a lithophane from makerworld with a 0.2 nozzle and still haven’t figured out the reason behind the problem but I managed to work around it by downloading OrcaSlicer that is very similar to BambuStudio but with more setting to tweak and one of them was the Z offset. I set it to 0.15 and the print came out perfect. It was scratching the plate and hence the scratchy surface. Maybe you could try it.

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3

Thanks a lot! I’ll try that! I was hoping the bed leveling automatically caught this…

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4

i had a similar issue recently, ended up being a dirty extruder.
i usually use purge filament every couple of weeks, but apparently it wasn’t enough.
so if all else fails try taking it down and giving it a nice cleaning with a dry brush and some air

5

Hey there

This looks very similar to my issue that I had.

See my other post here in which I was able to completely fix this issue: https://forum.bambulab.com/t/bambu-cool-plate-supertack-im-losing-my-mind/122680/35?u=bradley_chuter

6

PETG does not like to be too crushed on the print bed like PLA, it increases the distance between nozzle and bed [z_off] the temperatures do not seem to be correct, the first layer prints at a high temperature and during printing it should reduce, not vice versa … A very hot material behaves differently than a slightly cooler material… After modifying z_off you should also slightly increase the flow rate of the first layer to avoid problems with adhesion or distance of the lines of the first layer … You managed to solve yours problem with the suggestions you received in your post?

7

So it turned out the clasp holding the hotend was loose / completely broke off when I tried to put in a new hotend. Trying to get a new hotend assembly and will update if this fixes it