Here is a Hydroponics bottle rim that I've been working on. takes 4 zip ties to fasten it to the bottle, and has 6 small holes to water your plants. be very careful with the inlet nozzle, if it breaks you'll have to print an other one. I run three of these with the smallest pump I could find at harbor freight ($8). I've been playing with the diameter of the water holes and how many of them. I think i finally got it right so that a 3/16" piece of tubing can drain the bottle fast enough. MAKE SURE to print these at 100% infill! also only print these in PETG because of the strength of the inlet nozzle and PETG tends to leak water less. Please post your makes, this has been something I've been working on for a few weeks now.
Print Orientation: Upside down
Support : none
Follow these, and you will have great success!