Some months ago in this column I ranted about the useless things produced by so many people with 3D printers. I ended the article by suggesting that those people should print their own 3D printer filament or “ink” to save the planet from drowning in polymer 3D printed garbage. At the Maker Faire that was held at the beginning of October 2014 in Rome and that I visited I encountered once more many useless 3D printed objects.