Fridge magnet pot planter

I design two different magnetic pot planters to add some green to my fridge. I use some plants that I have around to test the model but I am planning to replace the plants for some herbs to have fresh for my cooking.   The planter have 3 holes in the back for round magnets ( 12mm diameter x 2mm deep). Just glue the magnet into the holes and it should be ready to go.   I used some support around the edge of the top part to make sure that prints without problem.