how bake three different materials belonging to an object into one single textured one I have a texturing Question. I wish to make a textured bread sliced in 9 parts. I textured the whole bread with projection painting, and after that I sliced it in nine parts. In the holes created, I made a surface on every side of the slices which were textured creating a new UVMap and new material. Now I want to bake the three textures (the crust and the two sides) of every slice into one (the fourth), to export it to an external program, but every time, some parts remains white. However, the method works with the ends of the bread, where there is only a single section. I attach a blend file example with a slice and one end, sou you can see it. I use Blender 2.79, 64 bit in Windows, and I work with Blender Internal Renderer.  Thank you.


blend file
After some correction I got the baked image.



Second Figure is original .blend. There were some errors.
The Map name on the right is painted with a caution color. In addition to it, there are blank names in Map of other textures. 
Blender is not specified what to use from multiple UV maps. 
And perhaps the active material of object _2B.004 is UVMat.2A.