This is optiboot altered for Makerbot Electronics. Optiboot can be found here: http://code.google.com/p/optiboot/ This is based on the SVN repo found at: https://optiboot.googlecode.com/svn/trunk/optiboot This is still very much experimental. I have tested it, but only with uploading the firmware from the command line, not from RepG. -Rob Giseburt