SparkFun, a Colorado-based open source hardware supplier shows how a 3D printed robot can crack a safe in about 15 minutes. 
Nathan Seidle, founder of the company, carried out researches on a basic locked safe in order to design a robot for cracking a SentrySafe. For four months, Seidel and his team designed, printed, tested and tweaked the robot.
Within this time, Seidel and his team enhanced the functioning of the safe-cracking robot. At the beginning, the device was supposed to test every combination of the safe. The team modified this method called “bruteforcing” because it was not achievable.
So they took advantage of the flight tolerance for error of the safe (in other terms, a number above or below the right combination number could function) and now they just tested every third number of the combination (instead of every number).
The robot itself
It comprises an aluminum frame, magnets, an Arduino board, a motor, a number of sensors to check the handling of the safe and numerous 3D printed parts such as the bit that fits around the safe’s dial.
The founder would like to warn companies to realize that their products can be easily stolen, especially since with 3D printing and low cost electronics, it is easier to get access to cracking tools.
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