Recommended slicer settings, from the original post:

• Layer Height 0.2 
• Top/Bottom Thickness 0.4
• Top Layers 0
• Wall Thickness 1.2 (Wall Count 3 with Line Width of 0.4)
• Print Thin Walls yes
• Infill Density 35%

When loading the .stl split the model into separate objects using the Mesh Tools plugin. Select each swatch tile and add a per model setting for Infill Pattern, set to the appropriately to match the tile name.

Second .stl file is with a little square to change filament colour. I printed the swatches in white and black to better see the infill pattern. With said settings filament change should be added at layer 2 and layer 3.