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+====== Final words ======
+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-