A simple remix based on https://www.thingiverse.com/thing:2487428

Added some cutouts and changed the form to better represent the nice starform. The bottom is hollow and has a lid, so you can put your batteries in there. (I'm planning on adding a hole for the wires).

PLEASE NOTICE: this is a simple slide-on lid. Everything is designed to be a tight fit and to be held by friction. So depending on your printer you may have to scale this a little bit. My Anet A8 printed this as-is, and it came out perfect - the calliope is pressed into the bottom with just a little bit carefully applied force.