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My biggest problem is not being able to get sharp corners. Thats not a problem with Shaper Origin per se, but more with CNC based routers (note the chess board on their homepage, it doesn't have squares with 90 deg corners). If something like Shaper Origin supported being able to do this, I'd buy it in a heartbeat.

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You only cannot get sharp internal corners. External corners can be square/arbitrarily sharp. I don't think it's too big of a problem, usually you want things rounded to relieve stresses anyway, but indeed I can see situations such as aesthetics or piece compatibility this could be an issue.

Sharp internal corners are hard period. CNC milling machines have the same issue -- the usual way to to just use a smaller end mill.

You either need some type of punch or an (actual) shaper.

That's what square hole drill bits are for.

Those round the corners too I'm afraid.

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