** [http://slic3r.org/ Slic3r] and [http://reprap.org/wiki/Printrun Printrun]
** [https://github.com/daid/Cura Cura]
* http://wiki.ultimaker.com/Jamming
* To check, http://projectsilkworm.com/
* Check STL files for printability: http://cloud.netfabb.com/