Wrong algorithm

[5tools]

I wasn't able to quickly come up with explanation, but the angles are ok (seem to be) only for 12 fins.
As soon as I set them to 16 or any other "symetrical" number, it is not aligned correctly. There is a delta in each step that in the end creates a big gap between the first and the last pin.

[revetkn]

It's a rounding error, the algorithm itself is correct. See revetkn@db3e670