I model the bottom of holes as if they were drilled, but with a tip angle that is less than the support structure threshold angle. I'm not sure what the standard support angle is, but if were set to support anything lower than 40 degrees, model holes with a 90 degree or less inclusive angle. The slicer should not apply support inside the hole.
Edit -- Per Kmanstudios response below, my comment assumes the holes are vertical and facing the print bed. Obviously, if horizontal, that technique won't help
Edited by mastory
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rowiac 53
Small needle nose pliers or maybe a 3-4mm drill bit?
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