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Thanks for following up with a solution to the problem!

I was able to replicate your problem. (I had enabled that option many moons ago, and forgot that it wasn't on by default.)

I knew the model was a mess, but it always sliced correctly for me. You're the first to mention the error.

I have rebuilt the model so it slices properly, and saved it in STL format. (Even got the preview to show up correctly.)

Thanks again for helping me fix this problem.