Usually they create their own design so maybe having an open standard would allow you to do contract orders with any plastic injector that has the molds.
Anyone really. If you look at the quick connect fittings commonly found on German cars they're all built to a standard (VDA not DIN in this case) but built by the NORMA Group or Parker.
Usually they create their own design so maybe having an open standard would allow you to do contract orders with any plastic injector that has the molds.