Was looking at drip rings on amazon and had a WTF moment at the prices. Figured I'd rather spend a few cents in plastic so I did this design. In the end I want two lines going into it anyway and that isn't really an option with commercial ones. I would recommend against a transparent plastic and PETG is probably the best choice. I just used this blue stuff because it is easy to see if there are internal flaws before I print a bunch of them in black.
For automated irrigating with 1/4 rainbird input lines or 1/8 NPT threaded couplers. Two ports to allow redundancy. Secure with tent stakes or something similar. Print without supports. PLA will not hold up well in the sun.