I saw @TubeTimeUS on twitter with cross-section of electronic components, thought it would look awesome under a Foldscope.

To do this you will have to use sand paper to grind down a side of the LED with 100 grit and work you way up to a 1000 grit you have to this until you can see the tiny wire under the Foldscope.

If you don’t have the superfine sand paper you can dry coating the roughly grinded LED with some superglue.

I recommend seeing the video it is much clear.