Hi - this is a simple attachment to put a pressure pack spray can on the end of a pole. I use it to reach high into the branches of our fruit trees to zap the odd bug or two - you could also use it for spraying wasps or paint or pretty much anything you don't want to get close to.
The spray can fits into the rings, then attach a piece of light line to pull the trigger and spray away.
Originally I printed the socket piece with an ACME thread however the plastic split on the first test (if you look closely at the photo you'll see its held together with a cable tie). Eventually just went with a 1" un-threaded socket for an ordinary broomstick - simple and strong.
Print one of everything, and two of the rings then assemble with seven M5 x 25mm or 3/16 x 1" bolts. If you rotate the pieces around everything can be printed without support except for the socket - 20% infill and wall thickness of 3 will give it a bit of strength.
Add a 1" broomstick and use a small screw or a nail to hold it in place. Tie on about 6 feet of light line to finish it off.