Update 23/09/2023: I have tested the single point water spike and found that the hole was to small so it printed solid i have now made a v2 and made an adjustment so the hole is about a 1mm in diameter and prints without closing up

UPDATE: I have added a single hole water spike which i haven't tested yet but should be the slowest water spike

I have remixed the originals to water much slower, these watering spikes will water plants over the course of a few hours to a few days

Update: I have found depending on bottle size, soil moisture and how compact the soil is the rate of drainage may differ. I have added a 2x3 0.6mm which should be slower in both compact and loose soil and I will keep experimenting and testing

Have also found that under 1 litre works the best as 2 litres has a bit too much pressure and drains the first litre very quick so I will do some experimenting with 2 litre bottles

How To Make!

1. Get a PET bottle (the kind you get soda in) of whatever size you'd like (as long as it uses the standard PCO1881 thread).
2. Generate your model (or use one of the included example models), plop the stl into your slicer of choice in the orientation it defaults to, print at 0.3mm of better layer height, no need for supports!
3. Print away
4. Screw the bottle into the spike
5. Stick in a pot or garden bed and enjoy (I'm sure your plants will enjoy it too!)