Three times a week, Hu Songwen sits on a small toilet in his home in a rural east China town and fires up his homemade dialysis machine. Hu, who suffers from kidney disease, made it from kitchen utensils and old medical instruments after he could no longer afford hospital fees.
 
He was a college student when he was diagnosed with kidney disease in 1993, which means thatwaste products cannot be removed from his blood. He underwent dialysis treatment in the hospital but ran out of savings after six years. His solution was to create his own machine in order to slash his costs.
 
The machine works like an external kidney. It is made up of two compartments that are connected by a membrane (a film-like structure that allows only some particles to pass through it). Blood is pumped through one half of the machine, while the dialysis fluid is pumped through the other half. Hu makes the dialysis fluid by mixing potassium chloride, sodium chloride and sodium hydrogen carbonate (bicarbonate) into purified water. For the treatment, he inserts two tubes into his arm, which are connected to his dialysis machine. The blood is pumped out of his arm through one of the tubes, filtered, and then returned to his body via the other tube.
 
He has kept himself alive for 13 years using his machine.
 
2. Homemade Prosthetic Arm

Fans can do all kinds of things to show their love for their favorite superheroes. In the case of Archie Whitehead, a 17-year-old high school student from Welwyn Garden City, a town 20 miles outside of London, that means building an amazing, highly realistic costume of Iron Man. The homemade suit is so good that you can barely distinguish it from the one used in the movie.
 
In January 2013, Whitehead wanted to make an Iron Man suit. He saw that somebody in the United States had made a DIY Iron Man costume in fiberglass, but that wasn't going to be possible because it would be too expensive for a 17 year old. However, he saw that somebody else had made a Halo costume with foam, which is a much cheaper substance.
 
Once he decided on the material, he downloaded some 3D files from online prop and costumes forums and used "loads of reference images" to modify the downloaded templates. He then printed the templates and used them to trace the pattern on the foam, which he then cut with a knife. Once he polished all the corners, he glued everything together and used small bolts for the joints. He then sealed the foam with acrylic gel, which allowed him to keep the costume flexible while at the same time making it paintable. Finally, he colored everything with spray paint. Every part of the costume is made of foam, except for the helmet, which is made of resin fiberglass, which took him the most time to build.
 
The whole project took approximately four months. He put in a few hours of work every day during his spare time. The entire costume, counting all the materials, cost him about $500.
 
The suits featured in Iron Man 3 total $7 billion alone — previously they totaled $1.4 billion. Among the new bells and whistles are a hyper velocity shotgun and updated armor.
 
4. Homemade Rolls Royce

With theme park admission prices increasing every year, enjoying roller coasters is a privilege that many just can't seem to budget. Fortunately, a very skilled amusement park fan decided to build his very own coaster.
 
Located on a 10-acre plot southwest of Oklahoma City, Jeremy Reid built an incredible roller coaster in the backyard of his parents' home. It cost Reid $10,000 to build and features a 16-foot drop that propels riders -- friends and family -- to speeds in excess of 15 mph.
 
6. Homemade Jetski



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