I'm interested in this. After having my i3v for a year and a half, I'm not at all impressed with the design. I finally switched to a solid-state relay after burning through enough of the relays Makerfarm provides, and I'm tired of constantly having to tighten screws on the frame and tighten my belts. I'm trying to take a bottom-up approach to tuning in my machine and increasing the precision. I recently ordered ACME lead screws to replace the threaded rods on the z-axis, aluminum extrusions to make an all-metal frame, and aluminum motor mounts, carriage, idler, and bed. That will be my weekend project if everything comes in by then.