Hey Sam Underland,
I moved this to the Developer Community as well where it is more likely to get a response from someone with API experience and knowledge.
+1 on Diego's comments around screenshots showing "want" vs. "get" when printing...
Sorry, I can't share my example, being on the corporate network.
There is also an idea already posted at:
It seems the developers were more concerned about mis-rendering a printed visualization than in providing a print capability for embedded content. Given that the idea only has 8 supporters so far, they might be right.