Beer / Soda can (Standard US Can Size)  koozie designed to look like a radiation waste barrel.

Print at 0.2  mm layer height or lower.  The examples in the photos are printed in PLA.  But for a more durable koozie - try PETG.  I like ColorFabb's NGen.

For best results, add a support for the bottom fan blade on the koozie.  

Print out the Radiation Warning Symbol.  Provide 3 for each koozie.  Super glue the warning symbol pieces into the koozie.  Choose any colors you like. The official colors of the radiation warning sign are yellow and magenta.