About 1%.
If you follow the current trend of doubling sales year over year, that will end with every home in the US as having a home printer in under 10 years. (That is likely where Disney got their prediction that in 10 years every household will have a 3D printer.)

In 2012, there were 80k printers sold, leaving a total of 155k in homes. We expect 160k to sell in 2013, 320k in 2014, and so on.

This means that in 2016 there would be 1.2 million units in homes. There are 115 million households.

So, about 1%.

But don't forget, 1% is still 1.2 million units! That's nothing to bat an eye at...

Drew Taylor
Cofounder, CEO
https://3Dagogo.com