Resin casting can easily be done in a garage or shed as part of a small operation. Room temperature vulcanising rubber is a thing as are tin/platinum cure silicone rubbers. Pressure/vacuum systems for degassing resin are also good to have. You can probably set up a decent resin casting sytem for under $2000. Scales, mixing gear, a couple of pressure pots 3d printer for masters and a good supply of resin/rubber. (I have a small setup in my shed for casting up pieces I've sculpted myself. The resin/rubber are the two most expensive parts of it.). Injection moulding of plastics - not unless you have access to industrial power (and the funds to run it) plus coolant systems (injection moulding machines run hot) and ventilation/ fume extraction systems (molten plastics put out some noxious fumes) As well as a way to have your dies produced so you can do the moulding of the sprues. They are still carved out of blocks of metal. They are just cnc milled out these days from a 3d plan. This will cost you into the multiple 10s of 1000s minimum. Even if you can get the injection machines second hand.
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