Filament desiccant holder

I found my collection of desiccant bags were either too old or used up, so I bought some loose desiccant form ebay £5 for 500g. and designed this little box to fit in my filament storage box.
The box contains around 200g of the gel balls. They were sold as 2-5mm balls and the air slots are 1.6mm tall. You do lose a couple of broken balls, but on the whole the balls are contained well.
I decided to go with a solid base for the extra rigidity. The flat square shape allows for a good amount of s