How To Un-Twist a Spiral STL Object? I have a cylinder-like spiral object as .STL file. There are edges responsible for being twisted (Highlighted in the image below). How can I un-twist it partially (or fully, so that I'd have a flat surface at the end)?





Edit:
What we want finally:
Compressed (left) vs Stretched (right)
The mesh is very messy so you can't really expect any tool to do a good job here. You can try Limited Dissolve (X-menu) and adjust the Angle and see if that works.
Otherwise it might be faster to remodel it.