You can go from napkin sketch to optimal design by using Topology Optimization
Design and simulation have always been considered iterative processes in product development. If you are going to produce your products using additive manufacturing, the way those parts are designed and manufactured is changing.
Parametric optimization tools automate design iterations when a set performance goal is used to find the most optimal candidate design. Topology optimization adds an additional layer of sophistication: it will guide any designer from the very beginning of the design process.
Topology optimization is the most common type of structural optimization. You can use it to predict optimal material distribution within the initial design space of a structure. It considers all applied loads, fixtures, and manufacturing constraints.