Sub 30$ 3D laser scanner

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I've added an Instructable to explain how to build, calibrate, and use the Sardauscan. Update: V0.0.0.4 released - much faster, better, stronger! The Sardauscan is a free and open-source Sub-$30 3D laser scanner that you can easily print yourself. Even for $12 if you already have a Hercules HD Twist. It's arguably the cheapest 3D scanner on earth. You'll need an Arduino Nano, one to four line lasers, and a micro geared stepper (28BYJ-48) - see instructions for BOM. No external power needed; just two free USB ports on your PC: one for the webcam and the other for everything else. Update! I'm proud to announce the release of open-source software for the "cheapest 3D scanner on earth" - the $30 DIY Sardauscan. The software is written in C# and allows you to compose your scan task by drag-and-drop. The recommended process consists of: "Scan" => "IrQ filter" => "merge laser" (if using multiple lasers) => "Build Mesh by interpolation" => "Save STL". But if you're not satisfied with the built-in processing tasks or prefer a more powerful software like Meslab, you can simply "Scan" => "Save Ply" and import it into your preferred application. The software comes with a building support for Sardauscan hardware and USB camera; you can easily write your own Hardware proxy via plugins or even build your own task to insert in the scan process. Source Code: https://github.com/Sardau/Sardauscan Real-time Scan Video: https://www.youtube.com/watch?v=TPb-gEVkBYo Post-processing starts at 1:50, if you want to see how fast post-processing works (smooth, mesh reconstruction, and STL generation).