F1 spa circuit

I have made a scale model of the legenardy circuit in belgium Spa francorchamps with the 3 sectores colours. When printing its inmportent to use support underneed the track. the only downside is that the back of the circuit not smooth is this can be fixed with a bit of sanding our if you have any ideas how i can fix this let me know and i wil try and change it. I also have a few difrent track that have to uploud if you want a specific track also feel free to ask. if you like my models pls boost me.