I always apply a thin layer of glue, not always for adhesion, but also to protect the glass in such hard cases. Normally Tough PLA stick as good as normal PLA, so maybe your glass was not clean enough.
And chipping the glass is easy. I printed with ABS and applied 3DLac on the glass. Worked perfectly, but I forgot to remove the 3DLac layer after the ABS print and chipped also my glass a little bit.
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toilet-ovule-add 0
Hmmmmm....
It was impossible to remove the residue, due to the fact there was no residue on the plate.
Seemed that the tough PLA was stronger than the glass. The residue was on the print and not on the glass.
Glass residue... The glass plate chipped, another lesson learned. Tough PLA is almost as strong as ABS and the same rule seems to apply here. Will use the other side of the glass and try again with a thin layer of glue.
Also see thread;
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