I printed the T-Rex Shower Head but wanted to cut down on the amount of water so my kids don't use all the hot water. I made this little flow restrictor to screw in. I left the hole covered just a little bit so I could drill it out progressively larger until I got the flow right.
The first print was a bit of a failure, it was a little too loose and slipped sideways - kids were complaining because the water pressure is too much without it. Need to add another thread or two.