Hi there
I think you may be worrying too much.
If you rotate the sketch by what Shapr measures it to be, Shapr now thinks it is at the desired angle of Zero.
The measurements come out right on my CAM software for cutting on my CNC, and that’s what I need.
Ronald Reagan got it right “Trust, but Verify”.
If you look at the screen grab you can see that the top line is at Zero on the Z axis. If there was any error in the rotation and export from Shapr there would be a value other than Zero.
It will be nice if we get a 2D DXF output from sketch at some point.
However, a radius (fillet) tool in sketch is currently higher on my want list.