Like many folks, I plan to put together a printer enclosure using a few IKEA Lack side tables. I'd ordered the tables but hadn't got around to ordering the acrylic sides, plus I wanted to get an idea of whether this approach would work in the space that I have, before all the sawing and drilling started.

Print 4 of these brackets, slip one onto each table leg, and you have a non-permenant (ie. no damage) solution to securely stack tables. I've been lazy enough that these have been in place for a few months now, and have proven surprisingly sturdy.