Calibration lines from PETG-CF left on high temperature plate

Bambu Lab X Series Bambu Lab X1C
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I did a calibration print with the PLA and one PETG-CF in my AMS using the high temperature plate. I didn’t use glue.

I removed all the filament, but I see discoloration on the bed where the calibration lines of the PETG-CF were. I tried to wash it off but it doesn’t go away.

Is this normal or did I maybe not wait long enough before taking of the PETG?

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Luckily, I didn’t damage the plate. It looks like it was residue from the PETG. I printed something with PLA (without glue) covering part the discoloration and the covered part came off.