The Nightly channel builds are not close to a Release like 41.0.1 as they are a work in progress due to checkins almost everyday for features and other things worked on.

Printing a web page is one of the most basic requirements of any browser. While I appreciate this browser is in Beta Test, learning that it has FAILED as basic a requirement as being able to print should get more attention than implied by this message. I am a retired IT Project Manager and can tell you, if I were managing this project, I would have wanted an error message that is more specific and the ability to collect data about the nature of the specific failure. Without this, you can have as many new builds as you like but, absent diagnostic information, the new builds may not be able to address the errors reported to you. This is like working in the dark and it is a mystery to me why anyone would want to work this way. Now, can anyone say when this issue may be resolved???

Any luck with multi-process (e10s) tabs disabled?