This is sealed, simple and quick to print model.

Turn your tin can into a flower pot by making a hole in the bottom of it. This saucer will catch the drainage. 

This model fits any can that is 100mm diameter or smaller. i.e.  Diced Tomatoes 796ml /28 fl oz., Medalgia D'Oro coffee can.

Project url – https://github.com/avolkov/openscad-designs/tomato-can-saucer

I didn't have any leaks when printed with 0.5mm nozzle at 0.4 layer height.