Simple bracket to improve the rigidity of ikea lack tables. There are many like it, but most others I've seen so far have been too flimsy for my taste. These provide some nice stiffness to the table.

This bolts in cleanly with 3.5x16 SPAX wood screws.The holes are big enough to fit a torx socket extender through, which makes fastening quite easy.

I printed these in PLA, 0.3 height, 0.5 width, 3 walls with 'Alternate extra wall' enabled in Orca.

I used 15% adaptive cubic infill.

They use quite a bit of material, depending on wall amount between 150g and 250g, but 4 already improve stability a lot. I think I'll print a whole set of 8 just to be safe tho.