This is a bracket for stacking LACK tables. I designed it with a 50mm lift to give plenty of clearance for my Prusa i3 Mk2. It also preserves the 2mm inset from the tabletop edge for the legs.

Print with supports as there is an overhang that I haven't worked out yet.

Assembly: It should be easy to figure out, but the little sleeve needs to be inserted into the base, then the upper leg will slide over it.

Original Design is located at: https://www.tinkercad.com/things/dBvuNm5kCJ0-ikea-lack-stacker