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Custom "cutter" and path

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Custom "cutter" and path
I'd like to define a 3D shape using a cutter of a pre-defined profile (e.g. square or hemispreical) to follow a 3D path.

Specifically, this would be to form a spiral groove around the outside of a cylinder at a possibly-variable pitch along a specified length of the cylinder.

Can this be done "easily" with a non-obvious combination of existing stuff in VariCAD?

If it weren't difficult, I wouldn't ask.
why not use helix?
In your case you just draw a helix with your profile and subtract it from your cylinder, wouldn't you?

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