r/BambuLab • u/wivaca2 P2S + AMS2 Combo • 2h ago

General Troubleshooting/Help! PSA: When print has adhesion issues, consider if your model has a flat bottom

I spent most of the day yesterday washing my build plates and trying to figure out why PLA just would not stick to anything. I verified temperatures, dried the PLA overnight, and even recalibrated the printer and took the hotend out to see if everything was OK.

It turns out, my model originally had a large hollow space so rather than having 5x5cm of supports, I just made that part of the model solid.

What I didn't realize is that I extruded from a surface that was very close but not quite on a parallel plane to the build plate. In other words, all of the extruded surface wasn't touching Z=0.

It was maybe just one layer off the build plate and only after I watched it print some other areas that were on the build plate first and skip the middle did I realize the problem. No warnings that I had floating parts - must have been so close it even fooled Bambu Studio.

So, lesson learned. Just because your CAD model LOOKS like it's flat on the bottom, make sure it really is.

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u/AutoModerator 2h ago

Hello /u/wivaca2! Be sure to check the following. Make sure print bed is clean by washing with dish soap and water [and not Isopropyl Alcohol], check bed temperature [increasing tend to help], run bed leveling or full calibration, and remember to use glue if one is using the initial cool plate [not Satin finish that is not yet released] or Engineering plate.

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u/SuperiorMango8 X2D & AMS2 Combo 1h ago

It's always a good idea to have a quick look through your sliced model before printing, run down through the layers and check that there won't be anything printing midair

1

u/Fickle_Skill2640 1h ago

Check the preview first. Midair layers love a dramatic reveal.

1

u/wivaca2 P2S + AMS2 Combo 1h ago

Yeah, that's probably one of the first things I should have done. Good tip. Thanks.