After speaking with a number of vendors, various people in the Linked-In plastics groups (Plastic Experts, Polyimide & High Performance Polymers, Polyurethane Illuminati, Polyurethanes and the Society of Plastics Engineers, Inc.) and Michal Zalewski author of “Benchtop CNC manufacturing tutorial for robot builders, model makers, and other hobbyists”. It looks like two part liquid polyurethanes with optional short or long glass or carbon fiber reinforcement is my best bet. This solution enables me to produce production parts with a simple direct pour process, e.g. no need for a large expensive press. I can use two part silicon or aluminum molds and when I start to scale production I can move to the RIM, RRIM and SRIM process. This leaves injection molding to very large production runs. Two part liquid polyurethanes can be purchased in liters, gallons, 50 gallon drums and by the truck load. Prices range from a few dollars to $120 a gallon.