IThe doll opening in the center is 20mm across and 60mm high, so it's for a rather small doll. If you need a different size, modify the parameters at the top of the SCAD and regenerate a new STL.Print flat, then fold. It should snap into place.
I'm a computer person who grew up on a farm. I enjoy all kinds of making. Programming, electronics design, rough carpentry, whatever.I am a mentor for FIRST Robotics FRC team 1502, "Technical Difficulties" at Chelsea High School.