This is a derivative work of Darth Vader by arhimed and bre. I downloaded the cleaned Darth Vader file from arhimed and checked it in netfabb Studio Professional. The file actually contained 486 triangles with invalid orientation. I fixed this in netfabb Studio Professional with the following commands The select shell/toggle selection/delete sequence obviously run some risk of deleting stuff you actually want in the file but in this case I do not think that happened. This file has been used in several successful builds in the RepRap machine from Bits From Bytes.