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Build Plate Adhesion

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That happens with XT material if the orint is removed when the glass has fully cold down.

If that happens with pla is only because you used and adhesion helper and didn’t fully wait for the bed glass to cold. Some users put it on the freezer to help remove it. I just use hairspray (if it’s a complex part with tons of cooling) and to remove it I apply some windowasher drops (or isopropyl alcohol) and the part separates from the glass without any issue or mark.

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I have had that with PET and using dilluted wood glue as bonding. During cooling down I already heard weird cracking sounds. When I took off the model, it required very little force, but the glass was chipped. So it probably chipped already during the cooling cycle. Anyway, even with full cooling, I had absolutely no warping during printing. :)

Now, if the model allows, I try to print PET without any bonding aid, and use less cooling (to prevent warping).

Never had that sort of thing with PLA, using the "salt method" as bonding aid (=wipe the glass plate with a tissue moistened with salt water, leaving an almost invisible mist of salt).

If for a particular model and material, I would ever have to use any bonding aids like dilluted wood glue or hair spray, I would probably try neotko's release method: this releases the model when still warm, thus should give less risk of chipping due to different shrinking of glass and model.

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