Note: unless otherwise specified, the copyright for the models belongs to Anton Lukyanenko. You may print these models and copy the files for personal use only.
Instructions: print all three files (layer 1 requires support), then assemble into a free-standing object.
Nine touching tiles in the Heisenberg group, which look rather like Sauron's helmet. Print with support.
An anticube is the image of a cube after inversion in a sphere. Print two copies of the file, then glue together. Also, notice that the base of both is an antisquare.