When 10-year-old Casey Doyle was diagnosed with a rare form of cancer, he wished he could destroy the tumor - which he had named Boris - with his own hands. So his doctors 3D printed a replica of the tumor, which Casey then smashed with a mallet. Then they printed more, so that Casey could smash it again - and so could his classmates. Read more at https://3dprint.com/132821/casey-beats-boris/