Chalks Support

This piece is the third design in FreeCAD, and the third "01 Series". It serves to hang, by the end of 1 mm thick, a basic slate of chalks between the drawing surface and the frame, so you can keep handy eraser and chalks to paint.

This piece is a little more complicated than before, so I have not got round the edges properly: some of them have been unable to round them because they do not fit with the surrounding. I think the distribution and amount of elements of the piece (ie primitive cub