I know you said you don't want to build, but I'm going to throw some plans out there in case you see something that you can work from, like maybe it might make you think of a way to re-purpose or modify something you already have. I have made some of these plans, though, and they were pretty simple.
This is a sewing table with drop sides. I can imagine using this for all sorts of things, and it has hidden storage and folds away. It could be rolled into a closet or stored in plain site like an accent table. Just pull it out, set up the sides, do your thang, and then fold it up and put it back.
Ana White | Build a A Sewing Table for Small Spaces | Free and Easy DIY Project and Furniture Plans
I've made one of these tables, and I want about 73648 more of them. I've used it as a tv tray, laptop desk, rolled it to the side of the couch as an end table, and it's currently holding my printer. Seriously the handiest thing ever and super easy and cheap to make (or maybe you could modify something you already have with casters). You can see where some people have modified theirs with shelves.
Ana White | Build a Rolling C End Table or Sofa Table | Free and Easy DIY Project and Furniture Plans
I'm thinking that one solution to hiding the printer would be to set it up on something that serves as an accent table (or better, something like the sewing table above with the drop sides that can serve as a desk), and build a simple matching wooden box to cover it. Just flip the box over the printer, plop a vase or photo frame or whatever on it, done, hidden storage.