It is using Arduino Duemilanove + GRBL (0.8c) + 100mW blue/ violet lazer with external battery power supply (5V) Drawing program is inkscape + gcodetools, gcode sender is Unversai G Code Sender. I want to share with u but it is really difficult for me to explain it in english… I just want to share some experiences, or, may be u can ask me… Also, most of the technical things (especially about GRBL) u can find in the following articles.”