Shop.Vac makes a wall mount vacuum. It's pretty decent, but it comes with a net bag for keeping the attachments and it's terrible. This unit will hold the two extensions and the crevice attachment. I purposely printed the back thin, and it was probably a mistake. Oh, it's solid its only intended to hold a couple ounces, but if you mount it with drywall anchors it kind of flops around a bit. It holds the pieces firmly and it takes a little twist to pull them out but that is how I like it. Nice and straight.
FreeCad. I thought about making it in Blender but I wanted it to be parametric. Unfortunately, it ended up being a fixed unit.