Sea Urchin Hat

I made a little hat for the sea urchin in order to keep him from carrying around shells or corals.
In nature they often cover themselves with this kind of stuff to avoid predators which are normally not present in saltwater aquariums.
Also it's kinda fun.
Use PETG to avoid introducing chemicals into your tank and making it somwhat saltwaterproof.

Use Ultradetail (0,07 or even 0,05) on Prusa Printers since the model is very small.

Some small supports may be needed.