People said the .3MF file was not working, so I have uploaded an .STL now.
Print like this:
The author remixed this model.
Centering disk remix to fit larger Sunlu spool center holes for Miklos Kiszely spool winder.
This is for Sunlu spools with ~72mm center hole.
I embossed Sunlu and 72mm all the way through.
The .3mf file has both sides on the same build plate already for easy instant printing.