How an 83-Year-Old Inventor Beat the High Cost of 3D Printing

"This home-made filament dramatically improves the economics of 3D printing. For instance, producing 392 chess pieces in a particular color requires one kilogram (2.2 pounds) of plastic. Buy one spool of mass-produced filament, and that will cost you about $50. Buy a kilogram of pellets and make your own filament, and the cost goes down to $10. Buy 25 kilograms of pellets in bulk, and you can print the chess pieces for just $5."