Magnetic storage box for fridge

We do have a lot of magnets from WolffKids to plan the week together with my kids. To organise the magnets itself I was looking for a solution. The vendor does have a similar one but I wanted to design it myself. 

The box can be printed easily without supports. A pause should be added at 42.2mm height to insert the 20x10x3mm magnets. I have designed the holes with some spacing (0.2mm) to fit them easily also with tolerances. You may want to glue them in before continuing the print. 

I have also uploaded a version without the space for the magnets so everyone is free to add cutouts in the slicer for different sized magnets. 

Print upright without supports.