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I think it is about 0.1 inches. That distance is not super critical, depending on the flow rate of you pump.
It is definitely a good idea to reuse net pots, unfortunately I designed this to use custom pots because I did not have any to start with. They are a lot smaller than 3 inches. You would probably need to redesign the cup holder pieces.
That is correct, the water runs down the diverter to the inner edge of the pipe. The water then runs down the inner edge of the pipe, dripping onto the plant pots.
Hi dominic, you should be able to print the top cap just fine without support if you have a good enough printer, and if you dont, the inner finish doesn't really matter anyways.The water diverter spreads the water out from the hose, to the edges of the pipe, where it can then run down the inner diameter, dripping over the plant pots.
The printing time is quite a lot, specifically for printing the pots. these require high retraction distances in order to not string, and therefore take quite a bit of time (~4 hours each, with 0.1mm layer height). The pot holders took probably about 5 hours each.As far as the amount of plastic used, with 0.8 mm wall thicknesses I believe the entire pipe took less than a 1 kg roll of plastic, so ~$20 or so, depending on where you source your plastic.
Modular Hydroponics SystemView Instructable »