The impossible dovetail puzzle box

Dovetail puzzle box. Clearance between the two pieces is 0,15mm. You need an accurate printer for this tolerance but the spacing will be perfect, so that you won't be able to see the steel ball, which is responsible for the locking mechanism.

I had made a 0,3 clearance model first. It will fit easier but due to the bigger spacing the steel ball can been seen if looking into the spacing directly, which destroys the tinkering quite a bit.

The magnet needs to be placed on 4.68mm z-height. Pla