You can add a 3D print head also. He also has a metric version for EU members.
http://www.thingiverse.com/thing:724999
$250 in parts. Supply your own 3D printed parts
nice
fantastic
The frame is electrical conduit
This is in my todo(build?) list.
Printing the parts now.
I have that printed and waiting in box for some time to assemble. can’t wait
Did you print in ABS or PLA? PLA is recommended 'cause of shrinking issues. But I’m willing to try ABS.
I did print in PLA - just had that laying around.
I would not try ABS. To much shrinkage. I am printing in PLA and the parts are turning out perfect.
Ok, thx! Time to buy PLA… Or account for shrinkage 
The PLA parts are turning out perfect on the printerbot simple metal. The designer designed the parts to print perfectly in PLA.
I really like way your running on rails with 608’s instead of linear bearings, very nice!