This is a brace I printed to link my printing table with the back wall. It make the table way more stable and greatly reduces vibrations. Just print 2 parts, screw one into your table and the other into your wall, then bolt them together with M5 nuts and bolts. Then do it again with two more parts for the other end of your table (4 parts total). You'll need 6 bolts and 6 nuts to do both ends, plus 3 wall screws and 3 deck screws (for screwing into your table).

I also put some blue loctite on the threads so the nuts and bolts would stay put regardless of vibration levels. And I used washers at each end, which is good practice when torquing bolts onto plastic parts.

It is a bit of a pain in the but to make sure both parts line up, the one on the table and the one on the wall. I installed the part in the wall first, then bolted the other part to it so it just hung in the air. Then I placed my table against the part, marked the hole centers on the back of may table, removed the table, removed the bolted part and screwed it into the table. This way I knew both parts would line up. I did this for both ends of the table at the same time.

A bit of a hassle, but now I have a super stable printer table that does not move at all even when printing a high speeds.