I am looking to build a plastic injection machine. I know I can buy the small manual bench top injectors for less than a $1,000. However, I don't think they meet my needs. I could also buy a used automated injection machine for less than $3,000, but I think it would be fun to build one my self, but I need a little help understanding the machine.

I want to build something similar to this concept. https://www.youtube.com/watch?v=4xww...SDemMNNxAc4WaI

I want my machine to use air cylinders to inject the mold. I want the machine to be able to eject the pieces. I've been reading you can now use 3d printing to print out molds for small production runs. I've also read were people have used 3d printing to make the molds and then casted them in resin which allows up to runs of a 1000.

My goal is to document the process with videos including making molds. I want to make it very comprehensive.

I have a lot of ideas but I was wondering if anyone has more knowledge in this area and could give me some guidance. Thanks