[ErroneousBosh]

Isn't the pressure required to deal with injection moulding kind of ridiculous, and you need to get the die stupidly hot?

[Animats]

Yes, and yes. Yet most of the world's cheap plastic stuff is made that way. Here's the hobbyist version.[1]

[1] https://www.youtube.com/watch?v=5-tZ4l6tXPw