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"how I came up with this idea" is actually how I came up with it. After I came up with it I started searching for tool changers and found a couple but these were different than the idea I had. The idea is based on the camera tripod as I show in the YouTube video. I have to say that the design you have shared looks indeed a lot like my design and you can take my word for it that this is the first time seeing it. I try to be as honest as possible and if I am inspired by someone else's idea I will definitely mention it like I did with some other designs I made. For example https://www.thingiverse.com/thing:3479256 and https://www.thingiverse.com/thing:3376638

I will be the last person pretending to have invented the tool changer for a 3D printer ;) Thanks for your comment though, I think it is important that credit is given to whom deserves it. Next time I will do more research :)

Fully mechanical camera slider
CR-10 Dual Z axis upgrade