This is a broom or tool holder that snaps shut to secure circular handles. This particular instance was designed to fit around a 21mm diameter broom handle, but it works with similar diameter handles. It could feasibly be scaled for much larger things as well, however the screw holes and hinge pins will need to be adjusted as well. This thing prints in place in one piece with no supports (see print settings for specifics). I used nails that were 1.7mm in diameter as the hinge pins. Includes two counter-sunk holes to fit most small screws, as always, pre-drill your wall for best results.
Here is a video of this particular one in action: https://gfycat.com/ImmenseBeneficialLabradorretriever
.2mm or smaller layer height
If you print this at larger than .2mm layer height, your slicer may not leave a gap between the print-in-place hinges. I printed at a .2mm layer height and my slicer skipped exactly one layer for the gap and the hinges printed perfectly with no supports or fuss. I did have to run a razor blade down the center gap, however, to separate the gripping claws as the first layer fused a little. Mine was printed in ABS