In their own words..
They have released the open source files on GitHub
GitHub - e3donline/ToolChanger: STPs / STLs / DXFs / PDFs (https://github.com/e3donline/ToolChanger)
Announced on twitter
Twitter
(https://twitter.com/E3DOnline/status/1146776848300462080?s=19)
Hackadays take on it.
E3D’s Love Letter To Toolchanging 3D Printers | Hackaday (https://hackaday.com/2019/07/04/e3ds-love-letter-to-toolchanging-3d-printers/)
I'll be going over it myself later on.