This is a simple structure for create a simple robotic arm. I have created a tutorial for use this with a Viper software (http://www.viperize.it) and ST Nucleo board.
You can print the structure and follow the tutorial, you can have a simple robotic arm that move the laser on X and Y directions. You can program the coordinates of the point with the serial communication between the computer and the board.
See the tutorial on Instructable: http://www.instructables.com/id/Simple-Cheap-and-Multiplatform-Robotic-Arm-Powered/
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