Laser Engraver project

I saw some videos about Laser Engraver on YouTube, so I started to do this project immediately. It is really simple, so everyone can understand what is where. It is based on Arduino Nano and DVD-ROMs, also you can Google such projects in the internet too. I will use this laser: https://sl.aliexpress.ru/p?key=KkImtJr 

Also I have found a good version of it too, you can see it there: https://oshwlab.com/B45i/Arduino-CNC-Laser-Engraver