Printrbot Simple 1405 XL z-axis Extender

This thing allows you to extend the z-axis height, especially if you're using my cable chain copplers:

http://www.thingiverse.com/thing:514734
http://www.thingiverse.com/thing:514728

in conjuction with eddiema's open cable chain:

http://www.thingiverse.com/thing:40918

However you will need to drill a new hole for one of the screws in the large upright piece of wood.