Despite a few holdouts like Lulzbot, the entire 3D printing industry seems to have settled on 1.75mm filament. New Printrbots are exclusively 1.75mm, and Makerbots use 1.75mm filament.

If you have a 3D printer, chances are, the company you bought it from skimped out on the design of their filament holder. It’s okay though, it’s not like having a toilet roll holder for… ...

Polylactic acid, or PLA, is the most common 3D printing filament, and it's the easiest to use. Unlike most plastics, it's made from corn starches so it's nontoxic and, in theory, compostable ...

If you want to 3D-print all of your ideas, you’ll need to start with a hefty supply of plastic filament—the “ink” used by 3D printers. Or you could get a ProtoCycler and make your own.