10mm Hollow Calibration Cube

I was calibrating my RepRap Mendel and wanted to go small! :DIt's been done before but I couldn't find a model so here it is (:Picture is from first time at quite fast settings so could be better quality (;I might try a 5mm ;) --- Imported from Thingiverse: https://www.thingiverse.com/thing:4249 Original creator: Laurencio