If you have a general idea of what you want to make, these factories will help refine your idea and think through the different components that involve the making of your idea.
This stage involves gathering all the necessary materials needed to make your product. Some factories provide materials and assembly; sometimes you will need to buy materials separately.
"Production run" means making a lot of one product at once. The factories listed under "production" can produce small and/or large quantities. The minimum order for a production run can vary from factory to factory (some have no minimum, some require a dozen, and some require up to 1,000 to be made at once)