Filament Comparisons

Planning to use the following models for filament comparisons:


 * Tree Frog: http://www.thingiverse.com/thing:18479


 * Make Magazine's Torture Test (2012 printer comparison part): http://www.thingiverse.com/thing:33902


 * Maker Faire Robot (2013 printer comparison part): http://www.thingiverse.com/thing:40212