Check this guy out, he built a personal roller coaster in his back yard. It works pretty good. Incredible what a pile of steel, a welder, and a passion for something can accomplish.
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Other cool hacks and mods from our Archives: DIY Metal Bend Roller
 Welding Basics: Joining Plate Steel
 Homemade Nigerian Helicopter
 Guy Makes Giant Tesla Coil In His Garage
 Hexapod Robotic Walking CNC Router
 The Making Of a Custom Steel Bicycle Frame
 DIY Arduino Digital Speedo
 DIY Video: Cotton Candy Machine
 DIY Hot Tub Project
 Laser Guided DIY Wrist Crossbow [WristBow]
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