I printed a benchy and done simple stringing tests and those passed. On real prints, I kept getting stringing! I modeled this variable stringing test to test variable distances and in S3D I created 5 different processes, all at 45mm/sec retraction. first at 0mm, second at 2mm at so on up to 8mm. Then I fine tuned from there, only 3 prints until I got my retraction dialed in. This is much easier and faster than printing 1 at a time doing trial and error.