You may not be familiar with the term 3D printing but I bet you remember the replicator from Star Trek. Well kiddies, it is no longer just science fiction. Replication exists! Analog Science Fiction and Fact had a great article in the November 2008 edition called: “The 3D Train Wreck”. Thomas A. Easton, the author gave a great overview of the future of 3D printing. Simplistically, take your 3 dimensional CAD drawing and print it out on a laser printer that will print layers with some type of raw material. Each layer is adhered to the previous layer until you have a full three dimensional finished product. There are a variety of existing technologies that are doing this right now. Rapid-prototyping in industry is the biggest market right at the moment. Consider how incredibly convenient it would be to fabricate or replicate things right at home. My Polaris pool sweep needed a part yesterday. The part is unavailable, without the part the sweep doesn’t work. The alternative was to buy a...