This is an augmentation of my Printrbot Simple 1405 Expanded X thing
http://www.thingiverse.com/thing:383713
to allow you to completely print a frame, no laser cut plywood here.
Marked as a work in progress because I have not printed it myself. The only files here are the (2) parts for the base frame. All other parts are available on the source thing http://www.thingiverse.com/thing:383713