back bracket of the office chair that broke (seems like a kid chair or just on smaller size)
inside there is additional metal bracket, that came with broken plastic piece.
thus I bend it to what I thought to be the original state

• supports - I did print with them only inside, if you decide print it from the flat side might need them too on the bed surface or just edit file for better overhang.
• walls - did put a modifier for extra walls starting from 39mm and up (place where it actually broke, hope it holds)

good luck

some other designs, that didn't fit me:
https://www.thingiverse.com/thing:769069
https://www.thingiverse.com/thing:5674534
https://www.thingiverse.com/thing:4793981
https://www.thingiverse.com/thing:1687261