This is a quick nozzle holder that you can double sticky tape or use magnets to attach to your printers frame. It can hold up to three nozzles, including volcano, and supervolcano nozzles. There is a slot in the front to put a piece of 29mm by 7mm paper so you can write what nozzle is in what slot.
There are two versions, one that has a flat back, and you have to use double sided sticky tape, or some other method. And another that has two spots for 10mm diameter magnets, although I have not test printed it.
edit: I printed the version with magnets, and it works well.
The author hasn't provided the model origin yet.