Here is a pencil holder based on a single 180 atom Buckyball which has been distorted and turned inside out. A 180 atom Buckyball containing a smaller 180 atom Buckyball is included. To make printing easier the dual Buckyball is done in two parts which are glued together. OpenSCAD code is included.
All files can be printed directly on the build platform.
A few drops of superglue can be used to join the two halves of the dual Buckyball.