Here is simple hydroponic system made out of used tomato cans with a diameter 10 cm. Inside the can there is white layer which protects the cans from rust.

I sprayed the cans with black plasti dip.

For printing base, cover and basket I used PLA (layer 0,2, infill 10)

The diameter of the base and cover is little bigger (maybe 1 mm smaller diameter would be fine) so I used doublesided tape for the base (just four little pieces to stick the base to the can.) 

The basket is filled with coco coir.

In the can I put fertiliser for hydroponics.