Shameless plug for my new add-on, SimpleBake.
What is SimpleBake?
Blender 2.8 provides a very powerful way to create complex PBR materials by using nodes. However, what should be a simple process of baking and exporting these materials for use with other software or systems (Substance Painter, Sketchfab, Unity etc.) is surprisingly difficult.
SimpleBake aims to address this problem by providing a one-click solution for baking PBR maps from materials created in Blender 2.8
As a bonus, SimpleBake will also bake a ColourID map by assigning a random colour to each material. This is for use in programs like Substance Painter that use ColourID maps..
Full documentation available here: http://www.toohey.co.uk/SimpleBake/
Available for purchase here: https://gumroad.com/l/mzYoz