I wanted to test the opacity of various filaments for use with candles and tea lights. I didn't want to print things too thick for the material and have no light shine through. This is a test of simple test chips ranging from 1mm to 9mm in thickness, all 40mm x 40mm.

There's a zip file with all the 123D Design source files in case that's useful for anyone. There are also individual chips as well as one file with all 9 chips together.

I even included a hole in case you want to print multiple chips and run a chain through them to keep them together.

You could also use these as calibration tests I suppose.