Use them to quickly snap on accessories to your camera rig (wireless transmitters, audio recorders etc.). Please, don't ask why it's called the “wireless backpack" – there is absolutely nothing wire-related to it.
Anyway, there are three variants in total: One normal/symmetrical and two improved variants, with added securing mechanisms. Variant number three also includes an alignment marker/dot. Attaching things should work a lot more convenient this way.
Slots for regular photo ¼" screws + washers.
Holes are for 10x3mm magnets.
Print for your self and don't sell, obviously ;-)
The author marked this model as their own original creation.