Wanted to 3D-print a toroflux? It may be difficult. However, it turns out you don't need to. You could just make one using some 3D filament, esp. the leftover on a spool. The outcome depends on the diameter and the characteristics of the filament. But you will get a decent mathematical model for the toroflux, adequate for teaching and personal exploration. Have fun!
[Please make sure to try a Mobius Twist at the last step and see what might happen. ].