UC Berkeley researchers have now outfitted tiny RoACH robots with shell-like exoskeletons to protect the electromechanical innards from dust and water and help the bots slip easily through tight, cluttered spaces, just like real roaches. Videos below.
And here are instructions to make your open OpenRoACH open source legged robotic platform!
Armored Exoskeletons Help Roachbots Go Anywhere, Handle Anything (IEEE Spectrum)