The Print Step tool allows the user to choose a printer and to print data. The data that the Print Step will print needs to come from a slide or from any renderable object. A renderable object is an object that contains the data being used within the tool, in other words the tool knows how to write its information itself. A non-renderable object is one that is pulling its information from a different source.
An example of a renderable object is the Slide tool. That is the tool we will be using as an example. A non-renderable object would be the SQLL Write tool which is a data base write tool, this is not renderable because it pulls its data from a saved location, the data is not stored within that tool.
-Go into the tool's inputs page.
Use the dropdown menu to choose you printer. 
I
have chosen "print" from the dropdown menu because that was the name
that I gave to the "I will print this when I am done" section of the
slide. This was one of the Slide Entities.