If you want some truly heavy-duty 3D printing, youll be glad to hear that MakerBots Replicator Z18 is now available for pre-order. Pay $6,499 and youll get to craft objects up to a lofty 18 inches tall once the printer ships this spring. Should that be a tad overpowered, youll be just as pleased to know that MakerBot has started shipping the latest generation of its normal-sized Replicator for a more reasonable $2,899.