Those familiar with rapid prototyping (essentially 3D printers for computers) know that both machines and supplies can be extremely expensive. Now a group known as Fab@Home has published instructions and software for building your own rapid prototyping machine. The machine they propose is certainly not as durable or precise as the commercial offerings, but at a fraction of the cost it may serve your needs just fine. If all you’re looking to do is a bit fo experimentation or introducing students to what a rapid prototyper can do a less expensive system such as this might be all you need. NewScientistTech also has a story on the Fab@Home project.
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