I've put 3 tables on top of each other, for this you'll need an additional set of adapters to fix the extra table. I made a basic set based upon the already existing "regular" brackets.

I've added some additional holes such that longer screws won't interfere with the ones from the legs underneath. As well as a level shift in the two holes for the screws holding the table to be fixed on top.

Print instructions

I've printed the parts using standart PLA with the quality setting to 0.15, this might have been overkill...