A Minecraft Wither model I’m working on for my son and his friend. Once completed, it will be fully articulated. The heads will all be held on using LEGO Technic pins, which can be purchased in bulk from either Amazon or Ebay (search for “lego technic pin”). You can buy a bulk quantity of 300 pins for roughly $10. I’ll use the Technic pins as they are molded to very tight tolerances, are smaller, and are stronger than 3D printed pins of an equivalent size.
Bukito Gimbal Demo Print: 60% scale: https://www.youmagine.com/designs/bukito-gimbal-demo-print