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If you move X,Y separately but with a small enough step, it would be virtually indistinguishable from moving along the slope.

Interesting challenge, can you 'microstep' along two axis at once without losing sync? That would be neat. I think I've worked out a way to rotate them as well!

I would imagine so; it should be the same problem as helical interpolation, but confined to two axes. https://infosys.beckhoff.com/english.php?content=../content/...

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