Most .stl files aren't immediately ready for printing - learn how to easily clean them up and prepare them for the slicer.
netfabb basic for Windows, Linux and Mac is available for free at http://www.netfabb.com/downloadcenter.php?basic=1
Marvin by 3dhubs.com at: http://www.thingiverse.com/thing:215703
Vote on what topics i should cover next! https://surveymonkey.com/s/3X79F3T