Jewelry artist and prolific blogger Vickie Hallmark has a terrific series up about beginning to have molds made of some of her metal clay pieces.
More than a discussion of the technical bits, she goes into depth about designing with cast parts in mind.
Using the Component Approach for Metal Clay
Designing Jewelry – Same Components, Different Combinations
Here’s one on developing your personal design vocabulary:
And for being such a terrific blogger and sharing great info., I’m awarding her the Blogger of the Week!
Here’s the badge:
For more on the theme of wax and casting, see my post, Why Not Wax? which talks about wax vs. metal clay.
and Intro to Wax Carving with links to videos, sources and articles: