aquarium jungle gym large

Designed as an aquarium accessory that provides a place for small fish to find interesting hiding spaces and a sense of security.   The diameter of this item is approximately 4 inches which makes it very expensive when 3D printed.   Versatile plastic has a tendency to float in water so you might need to partially bury it under aquarium gravel or attach some small weights to keep it in place.

If you don't have an aquarium it could also be used as a decorative item on a shelf or on a desk.  If you won the Lotto and have lots of spare cash this might be the product you have been seeking.

A smaller version of this item scaled down to a factor of 75% may be found here:
https://www.shapeways.com/product/TXKKCUFPB/aquarium-jungle-gym-75-size?key=ec3d54591ae9cf3b6a32ce53859a812c

The safety of using 3D printed materials in aquariums with living creatures is debatable, so if you have doubts plan on using 3D printed parts in a decorative aquarium containing only plants, snails, and other robust creatures.  Even then I'd stick with the plain white versatile plastic options to minimize the risks of contaminating your aquarium.