A picture of the model would help as the words do not create an image in my mind.
Convex can work flat but the last bit tends to fail.
However, do not underestimate side printing with a brim - bit to make it work you would normally want to print slow and fairly cool.
Enough infill for strength and no more - perhaps none if you use two or three perimeters.
James
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ignace-de-keyser 1
why don't you print it on it's side? Making sure the convex shape isn't parallel to the glass.
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