And maybe you will give us later some examples of 3D printing!
About your question, it is quite difficult to answer you. I have so many parameters to take into account.
I expect from a case a complex design... which has to look simple! (I don't know if I'm clear) In other words, I would like to see smooth and fluid lines and a perfect coherence with the spirit of the watch and its dial. It is the reason why I have to judge the watch as a whole.
Last comment: the comfort on the wrist... and in this context, the shape of the lugs plays a key role.
One of my fav bulgari case remains the Octo case. 
Thanks for our post!
Fx