Skirk 3D took a Bambu Lab A1 — a machine built to move a nozzle in straight lines — and instead stepped its motors at the exact frequencies of musical notes, turning the printer’s own mechanical whine into a keyboard. Rush E is a meme staple precisely because no human hand can play it at tempo; a printer’s motors, it turns out, don’t get tired. It’s a 37-second clip, but the frequency-as-pitch trick makes you look at every stepper motor in the room differently.