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A steel frame like here ?:
http://www.thingiverse.com/thing:2156369/#comment-1257765

BTW, plenty of decent Prusa with a metallic frame. Smart people start with that or better design, not acrylic crap.
You would have been better inspired to do a correct Prusa with a metallic frame, not just a frame while keeping all the design shortcomings and errors of the Prusa.

Anet A8 Steel Frame (CHAVO A8)