I've been dismanltling scanners and printers to make musical instruments from their moving parts. Every brand comes appart differently and every motor has a unique sound which makes for a set of fantastic kinetic devices that each have their own ideosyncracies.
This is an obsolete scanner. The sound is a direct out from the motor. It's quite stiff so the initial movement is fast, making the output quite painful to the ear.
The waggly motor hanging from the end of a paper roll guide.
And the wonderful lumpy sounds of the motor that is a part of the ink cartridge carriage.
These are the raw materials for larger musical systems, and the cost nothing but time (which some may argue is the most expensive commodity of all).
ed. Everything comes apart in it's own way and half the fun is working out how to dismaltle one of these without instructions. Over the years I have aquired a collection of tools that are useful for this task, such as extra long screwdrivers and a particularly useful pair of needle nose pliars that can be worked under plastic lips to unclip covers. Sometimes I can spend what feels like an age looking for that last hidden screw that is preventing me from dissasembling the device.