Ring with hidden Message (Litophane)

This small ring might come just in time, if you forgot to get a present for your SO. 
It incorporates a litophane. So while it might look like a normal ring from the outside, it has a secret message, which will only be revealed if held up to a light source.
I've used some white PLA and a .2 nozzle to print this. With a .4 nozzle it might still work, but I had some problems so I switched to a smaller nozzle. 
As this ring only uses 1-2 Grams of PLA, it's fairly economical to print a few of them. As you can see by the 7 Prototypes I did to get to this version.