I needed to hang a bunch of bands and straps in my home gym, but didn't want to mount anything on the wall.  So I designed a simple a 5+1-hook add-on for a 2x2 power rack with 20 mm holes.  This is intended for lighter items like bands and straps.  The pegs are angled 5 degrees upward so things don't slide off.  Secured to the rack with a threaded nut that prints on the same plate.

 I printed this using PETG-HF, but I think it will work fine with PLA as well.  I recommend 3 walls and 15% infill, but it also works with 2 walls, just a bit more bendy.   Obviously need supports. 

If requested, I can easily adjust to different size racks and mounting holes or simply adjust the parameters in the included F360 file.