This is a replacement mounting bracket for a Noma holiday laser projector.  Might fit other brands too.  A quick google search suggests that this particular mounting style is very common.

It reuses the nut from the broken one.

Printing Notes

I'm using the floating holes hack, which is dependant on the 0.2mm layer height. If you want to use a different layer height, you'll need to go into Fusion 360, change the LayerHeight user parameter, and export a new mesh.

Post-Printing

The threaded part will need to be epoxied into the socket on the bottom.