Needed a hook to hold up my respirator mask and this wound up being the simplest solution, with bottom hook holding the main mask and top hook holding the head strap. Made it parametric so easily able to adjust hook thickness & length, and backer and cleat height and thickness to adapt to your system. I printed in PETG for the slight flexibility to engage/disengage the cleat lock repeatedly if needed. Just slide the top part on and then bottom should click in place to keep it snug. My cleats are 3/4" (19mm) plywood and ~80mm tall so that's the STL file included.
Fusion360 file is included to make adjustments easier.
Nozzle 0.4mm, layer 0.2mm, 3 walls, 15% infill, PETG. Supports needed for hooks.
The author marked this model as their own original creation.