STL file: http://www.geekhaus.com/makerhome/day31_minecraftstamps.stl
Tinkercad link: https://tinkercad.com/things/km2uKfEYPxK-day-31-minecraft-stamp-blocks
Thingiverse link: http://www.thingiverse.com/thing:156894
Settings: Afinia .2mm normal, 1 hour and 2 minutes for all three head stampers.