Tool changing on 3D printers is hot right now, and it’s going to be really interesting to see the ideas that reliable tool changing lets people try out. One such idea is having the 3D printer use a marker to label the enclosure and buttons it just 3D printed. The 3D print shown is an enclosure for a Pocket Operator by Teenage Engineering. [Marc Schömann] made the enclosure on Blackbox, a tool-changing 3D printer that he designed. The video below shows a pen holder drawing the labels directly onto the printed object. Pocket Operators may look like calculators, but they are clever electronic musical devices capable of producing real music. (The best way to learn about what they are and what they can do is to watch a tutorial video or two.) Enclosures have improved immeasurably as a result of advances in 3D printing. Customized and stylish enclosure designs are easily accessible to hobbyists, and if tool changers means a printer can turn itself briefly into a plotter in order to label what it just made, so much the better. What’s old is new again! Reminds me of when I was in college and we used pen plotters for any kind of small graphic line art: mainly 2D plots of our data with t...