It’s an operation most of us who own a 3D printer have performed. He reassembled the nozzle, and in a moment forgot to tighten down the grub nut that holds the heater cartridge in place.

This has to be one of the most uniquely disruptive uses of 3D printing I’ve seen: an ink refill company has successfully 3D-printed a Kodak ink cartridge, refilled it, and printed with it.