3Doodler's safer, cuter 3D-printing pen for kids called Start can already bring their imagination to life. But these new sets can help them get used to drawing objects if they're just starting out and take their creations to the next level. The company has launched new Start sets at Toy Fair 2018, including a collaboration with insect robot-maker HexBug. It comes with Doodlemolds in the shape of bugs' legs and bodies, as well as motorized parts, so kids can build actual moving critters and race their friends. 3Doodler says the kit can help teach kids physics, engineering and structural principles, since they'll have to make sure the bug they designed can actually move.