We had our prototype made with a 3D printer.. I used it to make silicone molds. I then used part of it to make a whole new piece and then made a mold out of that... Past all that part. But as far as us building a injection machine, we are capable in doing it. I'm just not sure if i'm up to selling and shipping them myself. 3D printers are good, but the item is made in layers. If the item is made in layers, it can split....
The problem with pouring is how much time it takes. I've experimented with several types of plastic. Each mold will hold up to about 30 pours. I've tried plastics that harden really really fast...too stressful....I have one that I get along with, 15 min hardening time, but its not really food grade. I've looked into one that sets in a couple hours and then you have to bake it. If I do anything with it, i'll just have a company make them, then, i'll feel less stressed if I have to ship.