Multi-material .stl creation - Solidworks

Create a Solidworks Assembly that only has the parts you want to print.

If a non-printed part is needed to align or setup the assembly then hide the part before continuing

Select all parts which will be the same material.

Save the currently selected parts

Select and then save the selection for each additional material you will be printing in.

Open up selection sets and then select and hide all of them except for one.

"Save As" the assembly.

Select .stl file type and include the material name as a suffix to the file name.

Open Options and make sure "Do not translate..." and "Save ... in a single file" are both checked.

Hide the material selection set that was just exported.

Show the next material selection set to be exported.

Repeat the "Save As" process.