i wonder how hard it would be to make a new floppy disk today
you certainly wouldn't be able to do a homemade 3½" disk, the mechanisms and hard plastic would be hard to work with
but a 5¼" disk might be possible, if you can figure out a way to get a good magnetic coating on a sheet of mylar or kapton or something
-F
@Felthry I wonder how much 3d printing would ease the 3,5 one