Looking for info to get started with injection molding

[Max@Mac]

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.

 

[Strostkovy]

If you can shell that part out then you can probably vacuum form them

 

[604Pook]

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