The Pineapple’s frame is 3D printed, and all of the requisite files needed to create your own have posted to GitHub for download. You’ll need more than a 3D printer and some keyboard hardware, however. Hidden inside the grenade is also an Arduino Pro Micro running the QMK keyboard firmware. Because there are only 25 keys to work with, one less than the English alphabet, each button has instead been programmed to type out an explosive sound effect like “Boom!” or “Kaboom!” But it can be easily programmed as a novel macro keyboard for first-person shooters, or as the most satisfying way to quickly end a long Zoom call.