But as we discovered for ourselves last year, it's not as easy as company reps make it look. There have been a number of variations on the theme over the years – including pro models, kid-safe cordless pens and slimmed down flavors – and all of these creative tools have had one thing in common, a single extruder nozzle. Clearly Scribbler believes that two heads are better than one, and the Ohio-based firm has launched a dual nozzle 3D printing pen called the Duo on Kickstarter to prove it.

Like other printing pens, the Duo works kind of like a handheld 3D printer, heating up and melting plant-based and biodegradable PLA strands as they move through the device from the top end by a motorized feed mechanism.