Dummy 13 "Head-maker" Boolean

Attribution: this is a remix of Dummy 13 1.0 by soozafone, found here: https://www.printables.com/model/981111-dummy-13-version-10

Have a model you want to turn into a head for Dummy 13? Use the "Dummy_Head_Boolean" object and a boolean difference operation to "cut out" a space for the basic Dummy 13 "frame, head" socket. Makes creating custom heads yourself or with existing files a bit quicker (this has been my noob solution to many, many Dummy-related challenges so far).

"Eyeball" head uploaded as proof of concept—lens slot fits 16mm glass or plastic cabochon. Some yarn and a little Mod Podge goes a long way...

Note 1: the boolean object is for 3D modeling, not printing. It's oriented upright and at 100% scale. The taller side faces the front of the head to align with the post of soozafone's "frame, head".
Note 2: banana head (pictured, no file provided) derived from here: https://www.printables.com/model/559142-low-poly-banana