It's created depositing layers of about four microns.

And his mouth must be probably about three microns.

This is 20 microns thin, so this is about a baby hair's width.

I assure you, this is very tiny. It's just six microns on a side.

A laser cutter to do press fit assembly with 3D from 2D, a sign cutter to plot in copper to do electromagnetics, a micron scale, numerically controlled milling machine for precise structures, programming tools for less than a dollar, 100 nanosecond microcontrollers. It lets you work from microns and microseconds on up, and they exploded around the world.