>>40656
It won't. My new design is the simplest possible.
Originally the frame consist of four legs, one board at the front, one at the back, two side boards, one horizontal board in the middle, and two slat rolls at the bottom screwed to the middle and the side boards.
One of the side boards split along its whole length and the bottom half broken at the third. See picrel, red lines show the split and the break.
What I'm going to do is taking apart the whole thing, clean the edges of the pieces of the broken side board, removing splits and splinters, then put the sideboards onto the floor flat like the middle board, nail the grills onto them and done. No legs or front or back boards. I could only break it if I'd step on the middle of the slat rolls.
I could just throw the mattress onto the floor, but I'd rather have an air gap below.

And this shit broke because it isn't one piece of board, but it's smaller pieces of wood (some shitty pine ofc) glued together and thin wooden "wallpaper" glued around them as a cover. I should have just bought real boards and built a frame from scratch tbh.