Talking of lasers I did this the other night just as a concept idea.

Used a sheet of 3mm MDF and cut 5 shapes out.



One had the centre profile deleted.

Just bolted together to show the idea but in real life these would be glued and dowels fitted to line up.



Another shot at an angle and with a bit of cleaning up with emery cloth.



It's noting special, just a drawing of the top of my head but from concept to finish was 20 minutes.

What for you ask ?

Pattern for sand casting, in some cases like this cover it's far quicker than using a router as the centre is taken out as a profile as opposed to a pocket.

Each layer can be made slightly larger than it's predecessor to give a draft angle.