Crafting Duplication

I was recently watching a video about duplicating items and decided to inform you about it since I didn't know whether or not this dupe had been reported, and either way would like you to know about it even if you haven't heard about it yet.

https://www.youtube.com/watch?v=sdV21tZSWKQ

(Video Not Mine)

Thanks for looking at this, even if it's already been reported.