Hiya,
you'll find that if the material is susceptible to warping that the thicker the part the worse the issue becomes.
it's like a tug of war. on one side there is the adhesion to the bed and on the other side is the shrinking of the layers. the more layers the more pull is created. with that in mind you can add direction of the pulling force. if you have a a straight wall then then you will find that the pulling direction is strongest along the length of the wall.
longer the wall, the more pull is created that way.
understanding that you then should be able to appreciate that discs/circles fair a lot better. add some brim and you shouldn't have any dramas.
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gr5 2,295
The shorter, the easier (so 3mm isn't too bad). Rounder is easier as well. And the less infill the better for warping.
I guess the main thing is that the bottom layer squishes well into the glass but here's everything you ever wanted to know to get your parts to never ever warp off the glass:
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