HotRod wrote:

... Making an injection
system will be simple if thats whats needed.

Famous last words, as we used to say. "Simple" is all relative to ones
abilities & experience. For me, making an injection molding system is
probably possible, but certainly not simple. YMMV.

Lindsay (Lindsy, Linds... ??) Publishing has a DIY molding system book
by Dave Gingery, if you do decide to go that route.

Bob