I use a microwave for my plastic. I use multiple molds of the same bait and 1 injector to produce 1-2000 baits a day. I heat my plastic, make 3 rounds of injecting then reheat again for 30 seconds. I have thought about going to a presto pot with stirring system but heating in that way causes more fumes and a exhaust hood is needed at that point. I plan to get a full blown injection machine in the future. near future I hope