http://3dprintingindustry.com/2014/06/06/b-hold-future-coffee-mugs-without-burning-fingers/
http://3dprintingindustry.com/2014/06/06/b-hold-future-coffee-mugs-without-burning-fingers
These look great so long as you never need to wash them… Or haven’t encountered fully sealed double-wall glasses before. 
I’d like to see a completely sealed ceramic version though.