I printed the wider one without considering that the ladder needs more points of support to prevent it from moving if someone stumbles on it. So, I made a version that is half the size. Two of these would need to be used to hang the ladder. Choose whichever you prefer.
Side support part is optional.
I used 3.5 x 20 chipboard screws.
Bracket printing:
Printed with PETG:
3 walls.
25% cubic infill.
0.24 layers.
No supports.
Print it on the side as it is.
Side support printing:
5 walls.
35% infill.
0.24 layers.
No supports.