They’ve been used by large companies for rapidly creating prototypes for at least a few decades, but finding a reason to put a 3D printer in every home hasn’t been as successful. Making accessories for your vacuum? Boring. Building pop bottle bridges? Meh. Super-sizing Lego? Hello holy grail of 3D printing.
Source: Gizmodo – Super-Sizing Lego Sets Is the Only Reason You Need a 3D Printer