Making a homemade engraving machine pt7

I found the design and measurements at the link below. please refer to the video in the link to get more info on the handpiece. I modified it and change it a little but the concept is the same. Thanks for watching, Enjoy everybody

https://www.youtube.com/watch?v=Cyh2OB41BAo&index=23&list=WL&t=21s

Видео Making a homemade engraving machine pt7 канала Nejc Mazej