This is a Gridfinity holder (it will sit on a Gridfinity baseplate) for JBC soldering cartridges. It's hinged so it can be upright when I'm working on a soldering project, and it can lay flat for storage. There are 2 components: the base and the holder. They slide together in the obvious fashion. I've also included a .step file of a version without the holes for the soldering cartridges, so you could modify it with holes or cutouts to fit other things.
The author marked this model as their own original creation.