Geode
thingiverse
This was a project that one of my 6th graders designed on Sketchup. We printed it with the GLOW PLA. It Turned out great. Looks like Kryptonite.
Download Model from thingiverse
With this file you will be able to print Geode with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Geode.