Injection MOLDS via 3D printing, viable VS cnc-work?

Im planning to put my hobby-project into production. I've made the 3D models and they have been modified to work with molds.

I was expecting "few thousand" euros but got offers no below 10,000€ making this VERY expensive run to start. That said, price for a single unit is around 2€ that was waaaay below what i was expecting. I should be able to make any investment back preeetty quick.

Heres a ling to my model. Its in its simplicity an Airsoft gun's magazine.
https://www.dropbox.com/s/bnyr1kv2lh...LODED.jpg?dl=0

QUESTION IS: can the molds be made via 3D printing and is it a viable competition to CNC-work price-wise?