About this 3D model

Data source: http://www.cs.technion.ac.il/~gershon/EscherForReal/ (C) Copyright 2002-2012 Gershon Elber, Computer Science Department, Technion The original stl data from the site above has a little bit error. Therefore I modified it for printing with UP! printer. I recommend you to use "up3" format file if you can use it.