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Looking for info to get started with injection molding

Thanks for the info everyone.
On further thought, it seems that my best bet will be cnc machining them out of UHMWPE in house for about $10 in materials per pair, which is not nearly as good as 3d printing ($3 and 3 hours of printing per pair) but will be much faster. Compared to the previous method of getting a shop to machine them for about $100/pair, its still a massive improvement.
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Could you possibly make an aluminum or steel block, then just 3d print a round cap insert that is replaceable?

Not sure if it is needed but then you can change sizes and replace the plastic portion as needed and it would be a lot faster print