Printing stopped for me after upgrading from cups-1.1.19 to cups-1.1.19-r1. The reason behind this is that in cups-1.1.19-r1.ebuild installation of the file cupsomatic got commented out. In the comment it states, that this is now done by the foomatic scripts. However foomatic is currently not a dependency for cups-1.1.19-r1. Emerging foomatic solved the problem. Reproducible: Always Steps to Reproduce:
well as it is only required if you already had foomatic-2.0 installed, i added this kind of dep ;)