Can ASEMBL create a stronger part by removing the z-layer notches through milling? Does roughing the surface of a print between layers increase layer to layer bonding by increasing the contact area? Could a smooth, spinning bit melt plastic (through friction created heat) in a controlled way and improve z surface bonding through welding? Could a sub-mm "needle" bit be used to form internal welds (press bit down, then make small spiral to force melted plastic into a "wall" around a hole)? Could a spinning micro ball at the end of a bit be used to weld surface layers together with the idea of getting the z dimension as strong as x-y dimensions? Since new material is not being introduced, the ball would also have to provide enough downward pressure as well as heat to form a weld.