Infineon have an app note on making a smart advent calendar ...

https://www.infineon.com/cms/en/product/promopages/smart-advent-calendar/?e=
lq_mid=3D4472&elq_cid=3D468714&ic=3D

haven't investigated beyond a quick browse of the page, but there are files=
 there for laser cutting the box and so on.




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