from 05/31/2016 - to 08/02/2016 I studied the Laser Cutter. this Laser cutter is very useful to cut the variety of materials, but it can't cut the metal like copper.

However, the quality of etching is not improved during this period. I suggest the next person who is charged of researching the Strength. this cutter is often weak during the cutting. I am not sure the problem. but it is not related autofocusing.

Thank you

-Suyong Lee 08/03/2016-