YouTube user “horseattack” has uploaded a video of a functional LEGO printer that he built, connected to an Apple Mac. Everything was reportedly built from scratch, “including analog motor electronics, sensors and printer driver, the USB interface uses a ‘wiring’ board.” Continue reading to see it in-action.

The pen slides back and forth, building images and text one line at a time. It’d probably have trouble with the finer details, though maybe it could just use a finer pen.

[via Dvice]