Designed this for watering my many plants. Mostly tropical and like fast draing soil. This applies water at many points. Much better than a single point which will tend to go straight to the bottom. Especially if you have sensors to dectect soil mositure. You can print in pla, but the soil will make it brittle over time. PETG is better.
Been using for many years now.
Fits Tubing 13/64(5mm) ID x 15/64(6mm) OD
This is what I use:-https://www.amazon.com/gp/product/B08V1VMLDD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1