Can anyone advise? So I’ve started to make my own bits for things around the house, but it’s coming out weird. I’ve had the A1 Printer (NOT the mini) for about 3/4 weeks, and when I print things out from the makers market, it’s fine. Should I be setting the print options differently for my own things? See images to understand what i mean… any help would be appreciated as I’m very new to the 3D printing game… thank you!!
NB: Forgot to say, I was using PETG for the filament.

I normally get top surfaces like this when the prints lift ever so slightly off the print bed at the corners causing the part to be too close to the nozzle at the end of the print.
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Hi, thank you - so any advice on how to combat this… ive just put my STL file in the Bumbbu studio and pressed print… should I be changing the default settings to help??
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When I get parts lifting, I first assume the bed needs to be cleaned.
I’ve heard it can be cleaned with Windex, but I clean mine with hot water and dawn dishwashing detergent.
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Thank you for that, i’ll give it a good wash asap 
Yeah, print bed adhesion could be a problem. If the issue persists, try using glue stick. Also, how many top layers are you using?
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Top layers… sorry, not sure or what that is to be honest 
What profile are you using? Default 0.20 mm Standard?
Those look like they curled up off the bed.
Clean it first
Secondly consider your cad for those objects, if they’re rounded upwards all the way around, you create a really unstable first few layers, they will want to curl or dislodge way harder than normal. If you can make a straight 45 chamfer (or taller) instead of a rounded fillet on the bottom, it will be easier to print.
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Top layers are how many layers does it do after the infill section. You can see this in the strength section of bambu studio:
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ah, thank you - still learning, but this helps 
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I’ve now leaned it - found that was the issue for a few people… didn’t realise not to paw the plate with my bare hands 
Thanks for the advice!
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For the hot end… its the 0.4 that came with the machine.
Yeah, i’ve bought some sticks and tried that, seems things really seem better with the glue as the room i have it in isnt the warmest in the UK winter.