A handle and spool holder that clamps on to both 12mm rods to add rigidity to your Printrbot Simple Metal.  This design fits right off the print bed and doesn't need support.  Print this with 35% infill or higher for strength.  **UPDATE**I've added an additional file optimized to print in ABS, it includes a tool holder in the top.   This design is meant to echo the aesthetic style of the simple metal, it is designed to not interfere with any working parts, its large but very sturdy.  Remixes encouraged - Sketchup file is included.