My wife was tiling our bathroom shower with a collection of tiles that she liked when we realized that they were different thicknesses. So to make sure they all had the same top level I quickly designed and printed these two different thicknesses of spacers. I've included the freecad file if you'd like to make them a different thickness for you. Change the first and only Pad to whatever thickness you need. They are easy to cut with a box cutter if you need to change the shape on a one off or two.
The author marked this model as their own original creation.