Irrigation Dripper/Emitter

I recently bought a micro irrigation kit for my poly-tunnel, only to find most of the drippers didn't drip! they either sprayed, fell apart or didn't pass a drop of water!! I decided I could do better. These Drippers / Emitters work, they work straight from the printer, no drilling, just remove the brim and straight to work.
I have used ABS so that they last, and I normally print them 8 or 10 in a batch.