Don't worry about the red and black... I was just running out of red so I pressed on pause changed for black and resumed.
2 functions for that compass...
first: Make circles, like any compass.
second: Reproduce irregular shapes like a rock. If you need to fit a piece of wood tight close to it.
If it is horizontal or vertical, you can even help the process with a torpille bubble level.
Look at 2 images and the video.
compas.stl | 217.9KB |