One of the main reasons I bought a new 3D printer is because, after almost a year with this A8, I still haven't figured out how to line up the filament when I load a new roll or want to swap colors. It's definitely not that I dislike my new Wanhao Di3 Plus, but I probably wouldn't have bought it if I had known this for design was available.
Anyway, this design works better than I expected it to. Thanks for the upload.
Update: Color-coded my printers to match the title bars on the separate Octoprint servers I have. Keeps me from stopping the wrong failing print.