Architect Hugo Riveros designed a low-cost, easy to assemble wheelchair he calls HU-GO that is simple to build with readily available materials. He replaced much of the hardware and components with easy to source materials and 3D printed connectors and supports so it can be assembled virtually anywhere in the world. A HU-GO chair can be made with some zip ties, a few wooden rods (like broomstick handles) as the support beams for the seat, plywood or MDF, some nuts and bolts and some old fabric so they can sew together seats and arm rests. You can find out more about this amazing open source 3D printing project over on 3DPrint.com: http://3dprint.com/106254/hu-go-open-source-wheelchair/