Help removing my model from a chunk of wood

As you can see by the picture, I have a solid that I want to remove from my base/block material. The base/block material has no fixed size/boundary.

What settings do I need to use so that it removes the 3d solid shown in the picture?

(Or do I need to modify my 3D model?)

use center of block as XY 0. then set Z normal to the top of the block