Does the filament keep the same color after printing? 1.75mm filament is the most common. This year, we hear that number is down by half. Set in London, in the 1960s, the show will follow the former British SAS soldier as he creates a security company and goes to work with young billionaire Thomas Wayne – future father to the man behind Batman. Some 3D printers still use the thicker 3mm style, though, so make sure you know which one yours uses before you spend a lot of money on the wrong material.