I have printed parts with 0.5mm holes in them with clear resin with no problems.Sometimes you have to pass a 0.5 mm drill bit through the part to clear out any resin
I’ve been able to print some really tiny holes.
The key is that the typical resin-clean process isn’t enough to clear the resin inside of the hole. Have you tried suirting IPA directily into the hole with the bottle and/or a syringe?
I’ve seen microfluidics projects made with clear resin, and there’s no way the typical process will clean those channels without some direct attention.
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