Super simple diy airbrush using marker pens. You can use just about any marker or paint pen in this, and it dries instantly with no clean up. This is powered by a small air compressor and built on a cheap air nozzle from Lowes.
== Body == Its just two two holes intersecting at 45 degrees and a couple makeshift thumb screws. Seems to work best when the pen is about 3/8" to 1/2" in front of the nozzle and the tip of the pen is centered in the air stream.
== Screws == If you have thumb screws it would be better, but I just used a couple small lag screws that I cut to size and filed the ends smooth. if you run the screws in and out a bunch of times then sand the threads you should be able to get a loose enough fit to turn easily by hand.