Now with more precise machining including mold line removal - no need for an x-acto knife!

Allows for the production of molten plastic in chemical plants. This can be piped and barreled, and turned into plastic bars later. It can also be used as a fluid crafting component in Advanced circuits and Low density structures!

If you have Space Age, the crafting recipes will work in Electromagnetic and Cryogenic plants (don't ask me how a cryo plant makes molten plastic).

Also: Yes, real injection molding typically uses a hopper with pellets of solid plastic rather than keeping the plastic molten. People aren't usually able to hold a whole nuclear reactor in their pocket either, though.