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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.
What's so bad about it? I have a few complaints about it being extremely slow on my hardware and having some weird UI choices sometimes, but in general it's great.