About this 3D model

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. https://www.youtube.com/watch?v=JSm0pXgfxlo