Modern shower head
Here is a modern design for a shower head.
The connection thread is 1/4 inch
Printing best in PETG
Assembly:
The shower ring is mounted on the cone of the handle with a little glue. It is best to screw the threaded piece into the handle using a little adhesive.
Insert a standard seal to connect the handle to the hose.
I have been using the shower head myself for a few weeks now and it works perfectly.
PS: you can find the shower head holder on the photo at ThreeD-Michael