Simple hydroponic system consists of water tank with nutrient solution, pot with grow media sitting on top and a usb-powered water pump connected to a sprinkler. Watering is automated by using simple timer or smart socket. Printed with PETG filament. 

You'll need water pump, 6 mm inner diameter tubing and timer / smart switch/socket.
As a grow media i'm using LECA pebbles and nutrient solution is made from General Hydroponics/Terra Aquatica two-part nutrients.

Pot suggested print settings:

0.25mm layer height
0.8 line width
0 top/bottom layers
20% gyroid infill
5 perimeters up until 6mm height, then 1 perimeter. (see screenshot)

Tank suggested print settings:
0.25 layer height
0.8 line width
5 perimeters
0.8 line width
Make sure you get solid bottom.

Sprinkler suggested print settings:
0.25 layer height
3 perimeters
0.55 line width
Layer height modifiers at 1-1.25 and 10.75-11.50 mm - Ironing on all solid surfaces. (see screenshot)

Don't use plain water without nutrients.
Don't use chlorine-treated tap water.
Plants will need light source.