Printing from Google Wave

The work around is to use the iPhone as User Agent:
google-chrome --user-agent='Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16' wave.google.com

This works even if you just open a new tab - no need to quit the entire browser first.