Here its my desing, its a completly new prusa i3 p3steel, based of old p3steel.
I desing it in solidworks you can download all source files in my github and see photos of assemble tolerances and print quality and include list of link where you can buy all components:
For more update parts please see this link
Source files: https://github.com/campy/P3Steel-2018-By-campy-V1
I use MGN 12C linear rail because its more small and lighter
If you understand spanish you can see my video when i explain more about the printer:
Regards!! and enjoy it