3-D printing, while unknown to most of the public, has been around for quite a while. Its industrial applications range from rapid prototyping and archaeological reconstructions to medical uses in implant technology and custom-fitted hearing aids. Now, the technology is becoming affordable for the average consumer: while an industrial-strength 3-D printer that can use materials like bronze-infused steel, or even titanium, still costs more than $10,000, desktop machines for printing hard plastics are being sold in kits available for little over $1000.