Sweet.
Yep, dealing with the suction cup is a nightmare with resin printing. I might have tried printing these open side down, raised on supports and kept the supports to the interior of the lid where they would be less visible, but there'd still be cleanup on the bottom of the lid and a reasonable chance the print would tear off the supports when it reached that large flat top surface. Angling would mitigate that a bit but result in even more supports on the lower rim of the lid and a high chance of the bottom rim losing its perfectly clean circular profile.
Only other work-around I can thnk of would be to print top/flat side down on the plate as you have and punch a small hole through the side to vent the interior cavity, but you're still filling in a hole instead of the stress line, so it's not really any better.
Not really any easy fix for this and I think you've chosen the best option.
Yes, I absolutely print them open-side down...it was just flipped for the screen cap.
I am desperate to avoid supports on the beveled surfaces themselves, because it seems even the lightest touch of sandpaper on those surfaces and I'm losing the integrity of the lines!
And yeah, thanks for the tips...that's the thought process I went through as well. After multiple painting attempts, it became obvious that the integrity of the bevels is crucial above all!
BTW, I believe in open source communities and not hoarding our stuff. So here's my latest STL if you (or anyone) would like to have a look, or take a shot at printing! I only ask that if you improve it that you share with the rest of us!