Stackable coin cell storage boxes

I needed a better way to store the coin cells I had so came up with this. 4x4mm cylindrical magnets hold the lids on and help them stack neatly. Notes:I ran out of filament, hence the different colours!The magnets are optional but very useful. I orient them such that the N pole is up on the front pair and down on the back pair so that the boxes only stack the one way around and the lids only fit the correct way around. The magnets should be a push fit - I did not need adhesive to retain them. These are widely available - I sourced them on eBay (https://www.ebay.co.uk/itm/334418413418)I used a white permanent marker to highlight the text. This is very effective and easy.