Sorting box - learning playful

I made this box as an inlay for another box, but it wirks perfectly on its own. the idea is from my partner so our kid can put wooden pieces in a box. just flip over the lid and start over. our kid gets really focussed for some time and it improves her abilities with small toys and concentration and frustation. just print it and click the lid in place. if you want another form or size for the slot in the lid, just shoot me a request.