Remixed the leg joiners (IKEA LACK stacking feet) to add a little more height and hold the upper table securely to the lower table without the need for screws.

v3 removes a hole in the model that was originally intended to accommodate a screw but as I never got around to using one I found it just made the bridging more complicated than necessary.

Creality

Ender 3

No

Yes

0.12

20%

I used Eurekatec PLA (locally made in Nova Scotia, Canada) and printed with my default 0.12 faster profile with 10% infill. Breaking in a new printer so used supports but if your bridging is dialled in you may not need them.

Essentially I duplicated the original design twice and rotated the duplicates to fit together in such a way so they would fit around the leg of the upper table to hold them in place and then against the outside of the lower table top.