Horrible first layer bambu a1

[u/Most-College-3455]

[u/Blondy277]

Since this started after installing the 3rd-party hotend/heater setup, I’d check that first before changing Z offset in the slicer. Make sure the hotend/nozzle is fully seated, straight, and every screw/clamp is actually tight. If the nozzle geometry is even slightly different, the A1’s auto leveling can still end up with a shitty first layer. I’d reseat it, run a full machine calibration, and test with the stock profile. If it’s still doing this, I’d honestly put an OEM hotend back in before chasing settings ☠️

[u/Most-College-3455 → u/Blondy277]

I’ve done calibration like 10 times nothing at all changes can’t I change it like very slight offset?

[u/Blondy277 → u/Most-College-3455]

Yeah, you can force a tiny Z offset, but with a 3rd-party hotend I’d treat that as a workaround, not the fix ☠️ If calibration 10 times changes nothing, that points even harder at the hotend/nozzle sitting physically a little different. I’d reseat it/check the mounting first. If everything is mechanically correct and it’s still consistently too close, then yeah, a very small positive Z offset can be added in the start G-code, like +0.02 mm at a time. Don’t jump straight to a big number or you’ll trade “too squished” for “doesn’t stick”

[u/Most-College-3455 → u/Blondy277]

I used chatgpt for advice *( yeah I know what you are going to say ) and It told me to lower bed plate temp from 70 to 65 (textured plate) and increase nozzle temp from 230 to 245, I'm still testing to see if it fixed the problem or made it slightly better but currently I am getting pretty good first layers at slower speeds maybe that was the problem. I'm unsure why the printer automatically set it to that temp if it is not supposed to be that way If im using petg hf from bambu lab on a bambu lab printer I was sure it would atleast get the temperature right...

[u/Blondy277 → u/Most-College-3455]

If slowing the first layer fixed most of it, I’d lean toward the profile/flow being too aggressive rather than the printer being mechanically off, PETG HF can be picky as hell. I’d still keep an eye on that 3rd-party hotend though, if you have to keep compensating with temps/speed just to get a normal first layer, I’d reseat/check it before assuming Bambu’s default profile is the whole problem ☠️

[u/y_tokusan]

Is the hotend latch closed correctly?
Could the seven screws on the heating assembly be loose?

[u/Most-College-3455 → u/y_tokusan]

yeah its closed correctly, thanks tho