I recently purchased a P3 Steel v4 Frame and apart from the 10mm smooth rods on the Y Axis I assume v2 printed parts are compatible? I was looking at printing up all of the toolson edition parts that I would need to complete the printer.
Did a Few Minor upgrades to the NCS P3Steel Base Printer, the Cordobesa Printer gave me a couple of Ideas so I redrew some stuff in the design.
mainly the Y motor mount now has a brace and no longer needs dual plates (can still accept dual plate style if desired)
and the extruder cut parts for all metal direct mount to Nema 17 motor similar to Cordobesa pictures
check it out and read the discription
and thanks to this for some ideas http://www.thingiverse.com/thing:1528308
my Free downloadable DXF version will not get these upgrades