Automatic Tool Changer
Non-contact ATC by Joshua Vasquez - of https://github.com/machineagency/jubilee - based on "The E3D Version was too expensive so I made my own"
Part of Machine Agency at U Washington with Nadya Peek at the head of the Machine Agency.
https://github.com/machineagency/jubilee/wiki - about the project
Source - https://www.thingiverse.com/thing:3365456 - open source
Author - http://www.doublejumpelectric.com/about/ - joshua [at] [thiswebsitename] [dot] com
Parts at - https://713maker.com/jubilee
License is legitimate - [1]
Study the above for open source tool changer.