Polyline from mesh tube

[martinsiegrist]

This might help:

Medial axis of compound mesh tube

I have a mesh tube imported from a secondary software. I’m trying to find the medial axis of the mesh tube so I can make a polyline to drive a CNC toolpath. I tried to take the mesh face point/normal to make and SDL line I was hoping to to find where curve|curve intersect then interpolate the points to a poly line. Two problems. The mesh tube seems to twist and causing the normals to be flip/flop. This method also seems to create ~40k lines. Doesn’t seem very eloquent. I would appreciate any …