There are also several Chinese vendors offering reasonably priced injection molding machines now, but unless you're well-versed in the art of dealing with these vendors and DIYing your own support, they're not a great place to start.
If you just want to experiment, you can build or buy a manual lever-operated machine for under $500: https://busterbeagle3d.square.site/product/buster-beagle-3d-... These won't be powering any production runs, but if you're only interested in prototyping then they can be surprisingly effective.
They're also very new, so they're not as mature as old machines. Older machines are massive and poorly documented, though.
This is one of the more polished micro injection machines: https://www.micro-molder.com/
This one is more industrial but seems better for continuous runs: https://www.apsx.com/desktop-injection-molding-machine
There are also several Chinese vendors offering reasonably priced injection molding machines now, but unless you're well-versed in the art of dealing with these vendors and DIYing your own support, they're not a great place to start.
If you just want to experiment, you can build or buy a manual lever-operated machine for under $500: https://busterbeagle3d.square.site/product/buster-beagle-3d-... These won't be powering any production runs, but if you're only interested in prototyping then they can be surprisingly effective.