I've recently updated the handle to make it more printable by creating a bevelled surface to provide more support to the skull, and enough material for the rod to bind with for the neck shaft.
In addition the stl files are orientated so they can just be downloaded and printed.

Print 1 of everything except the pin, you will require 2 of these.
Some assembly is required, and glue would probably be a good idea too.

See the screenshot for basic assembly order.
This fits a door handle with a shaft of 7mm x 7mm.