For designing screw threads, it is necessary to fix profile orientation along curve tangent. Current path extrusion: <img width="550" alt="screenshot 2017-07-18 22 28 45" src="https://user-images.githubusercontent.com/225266/28338258-abff2806-6c08-11e7-9b5a-6387bdf2b285.png"> How it should look like: <img width="550" alt="screenshot 2017-07-18 22 31 09" src="https://user-images.githubusercontent.com/225266/28338307-d2a4b836-6c08-11e7-94ac-35a495bda85c.png">
For designing screw threads, it is necessary to fix profile orientation along curve tangent.
Current path extrusion:
How it should look like: