This is a Kit that upgrades the Parallax S2 Robot in order to moves the robot's pen up and down.This Kit upgrades the Parallax S2 robot ( http://www.parallax.com/ScribblerFamily/tabid/825/Default.aspx ) in order to lift Up and Down a pen. The Upgrade kit has two printed parts: 1) the "Pen CUP" that lifts up and down the pen 2) The "Servo bracket" that holds a mini servo and 3) a Hitec Hs-55 mini servo that moves the "Pen CUP" up and down. I made this project one year ago. The primitive parts of this kit was made without the use of a 3D-printer. I hope that this post will help the S2 owners to upgrade easily their robot. Code and more information about this project you can find in the following link: http://forums.parallax.com/showthread.php?138538-Advanced-S2-pen-lifter-kitVideo of the 3d printing: http://www.youtube.com/watch?v=YhNzN5waTgo&feature=share&list=UUse-ryRUSkuIJjgmzqAizYA using a Leapfrog Creatr 3D printer.Feel free to suggest any impovement. Regards, Nikos Giannakopoulos