A small robot-style doll with arms and legs that can bend, but only in anatomically realistic directions. I have printed these in ABS/ASA, but most kind of plastic should work. No support is needed.
The joints are one-degree-of-freedom, except for the shoulder joints which, on purpose, are a bit loose to allow for more freedom for the arms to move sideways.
I have uploaded two versions; one regular and one with tighter gaps in the joints. Choose whatever works best for your printer.
The doll will generally not be able to stand by itself. You can, of course, fixate it in any posture by applying a drop of glue to the critical joints.
Update 2023-02-14: I have added a new version ("-v2") where the shoulder joint is stronger. When my grandchildren played with these dolls, this joint tended to break.
Also checkout my new and more human-like doll, based on the same principles: https://www.printables.com/model/775352-flexy-an-articulated-print-in-place-doll
The author marked this model as their own original creation.