The cost effective way of using a 3-D printer

Due to the fact that I cant afford a 3-D wax printer yet, I forward my Rhino designs via email to a company in Pretoria who prints and casts my designs in any material that I require it to be manufactured in. What I really enjoy about the way I am currently working is that I only pay for the exact cubic mm of wax and gold as opposed to having to outlay a ton of money