When making a shadow mask for thermal or spray deposition, I usually cut a few test pieces from printer paper. These tests help ensure that
I don’t waste any material
when I get to the metal cutting (usually molybdenum).
The micromachines OT Millennium Falcon (lower left), with the one I’ve given a wash to next to it. Behind that one is the white and blue YT-1300 that briefly appears in The Phantom Menace, and then at the upper left is just a random, grey, YT-1300.
Scientists have created a tiny biobot that can be implanted under the skin and deliver doses of drugs. The 3D-printed micromachine has no batteries or wires, but is activated through an external magnet.