One of the main reasons why desktop laser engravers are no widely
used to make models for casting, as you say it, is their limited 3D
Desktop laser engravers are great for making 2-1/2D models like name
There are laser engravers with full 3D capabilities but they are
very expensive. A 3D laser engraver for metal costs over $ 100K.
A good option to make models for casting is a desktop CNC, 4 axis. A
good 4-axis CNC's costs around $ 11,000 K.