It is a poker chip tray for 150 chips with a lid that is secured with a pin.
Designed for the Skyline poker chips (39.2mm diameter 3.35mm high).
it also has a stackable version. For people who want to store more than 150 chips with flat lids.
If you have other sizes you have to scale the parts. In order to find out the correct value for the scaling, I created a test piece
The author marked this model as their own original creation.