As sophisticated as consumer-level 3D printing has become, it still has occasional trouble nailing the basics. Printers still tend to jam, and a model that really likes one kind of plastic may balk at another. 3Doodler might have just fixed all that with its latest pen. The Create+ builds on the original Create with what the company says is the first dual drive system in any 3D printer, promising "almost entirely jam-free" drawing -- the days of a panicked halt in mid-project should be gone. This also helps it work smoothly with a greater range of plastics, including ABS, FLEXY and PLA.