Is there a Hiby R4 rugged case?

Has anyone seen a rugged case for the R4? I use one on my NW-A306 and it is great. I am just worried about the longevity of the included tpu case (it is so thin for shuch brick)

I've thought about 3d printing as an option... But I don't have a printer and it may not be as durable in the long term.

Suggestions? Ideas?