This is an easy application to build, however it is assumed that you already have laser-cut the three pieces of plastic that make up the body of the arm using the file provided, or have suitable replacement/stand in parts. For those without access to a laser cutter, you can use the Parts Drawings download to create your own parts using a method of your choice:
Links
[1] https://learn.parallax.com/sites/default/files/Files/Docs/Projects/Robotic-Arm/Robotic-Arm-Laser-Files.zip
[2] https://learn.parallax.com/sites/default/files/Files/Docs/Projects/Robotic-Arm/RoboticArmsParts.pdf
[3] https://learn.parallax.com/sites/default/files/Files/Docs/Projects/Robotic-Arm/Robotic-Arm-Code.zip
[4] http://www.parallax.com/sites/default/files/downloads/35000-BOE-Shield-Documentation-v1.2.pdf