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[not solved, but worked around] Tinkercad not exporting holes? They don't even show up in the preview. Some of my previously working designs are also doing this.
(sh.itjust.works)
I made this test block to test the fit on some holes (my printer isn't calibrated), when I noticed the problem. The cone on the side was a sanity check for this problem.
I tried googling but couldn't come up with this same problem.
Edit: I did just figure out a way, I made them a union group, which applied the cuts immediately, and they stayed when exported. I’ve never had to do that before. Though admittedly that's probably the right way, I normally use fusion360. Something is definitely weird though. It should just work without doing that. And in fact it did a few days ago on a different project file.
I always use union-groups when working with holes. Sometimes I even have to go through multiple nested union groups to get the desired result. But it always works when exporting, and you directly see the resulting shape in the editor (and the export).