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So..... injection molding.
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RandyT:

--- Quote from: Howard_Casto on February 13, 2018, 11:13:29 pm ---I looked into regular mold making, but the thing that was killing it for me was the material cost for the pours.  The closest thing I found to plastic was a polyurethane resin and it was something ridiculous like 60 bucks for a few ounces. 

--- End quote ---

https://www.homedepot.com/p/3M-Bondo-118-oz-Fiberglass-Resin-00404/205798046

$40 a gallon, and works fine with silicone molds.  Just make sure you get enough hardener, otherwise, soft and sticky is the result.

Should be good for painted figurines.  Not sure about mechanical parts.
JDFan:
Too bad they don't still make toys like they used to - I remember having one of the Hot Wheels Factories that was a mini plastic injection molding device to make hot wheels cars out of plastic sticks that is very similar to what you are talking about and could probably be repurposed for your usage. Had aluminum molds of the car bodies that you placed the wheels into and then melted the plastic in the machine and pressed it into the molds to make the cars.

Howard_Casto:
Eh some slow kid probably melted their eyebrows off so they took it off the market.  I don't remember those, but I remember one with plastic molds and a kind of wax used to make the cars.  I also remember erector sets made out of real metal, and chemistry sets that could burn down the house.  I also remember wood burning kits... or as we called them "teach your kids once and for all not to touch hot things kits". 
Mike A:
nitrogen_widget:

--- Quote from: Howard_Casto on February 14, 2018, 02:15:53 pm ---Eh some slow kid probably melted their eyebrows off so they took it off the market.  I don't remember those, but I remember one with plastic molds and a kind of wax used to make the cars.  I also remember erector sets made out of real metal, and chemistry sets that could burn down the house.  I also remember wood burning kits... or as we called them "teach your kids once and for all not to touch hot things kits".

--- End quote ---

metal erector set here.
Wood burners in boyscout camp.
Also had a science kit with:
shrimp
model rocket
weather balloon +helium and a bunch of other stuff I could've used to cause mass destruction if I was Lex Luther.

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