Is it possible to make a hollow object, such as a cylindrical container where I can put spherical objects inside?

Is it possible to make a hollow object, such as a cylindrical container where I can put spherical objects inside?
I have tried to make a hollow funnel in Tinkercad, and then exported as STL and imported into CoSpaces, but since the collision box will wrap up everything, that hollow part cannot be reached by other objects. Is there a way to overcome this?

I created an example using the CoSpaces torus and some dice.
See it here, https://cospac.es/QLgE.
Comments welcome.

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Super thanks for sharing, I will study it.

As far as i understand: any object you import will have the bounding box=collision box. So until they change this, which i assume is not high on their featurewishlist, you’ll have to build those things inside CoSpaces yourself, as done above. Not sure if you could use masking by other buildingblocks to make cuts in objects like you can do e.g. Tinkercad, since masked objects that intersect other objects behave atm rather weird.