I remodeled certain files to fit my laser cut prusa i3 frame with t8 leadscrews. The following are the files.
I used the dxf file from the lasercut to adapt it for leadscrews for the top support.
Trapezoidal nuts can be thermal melted in place with accetone or heat using the m5 part from here http://www.thingiverse.com/thing:1158265/#files.
Theres a new version with a cap to prevent the linear rods from sliding up and messing up the z endstop.
The x axis is modified from the smooth x axis mod and the tensioner arm for it is remodelled to fit 625zz bearings.
Other i3 Mods
Modified Spool Holder available here http://www.thingiverse.com/thing:755648
Smart LCD Holder with z endstop: http://www.thingiverse.com/thing:1803825
Credits go to the original creators.