I had reprinted my LCD holder and knob in white and black and wanted a little more contrast on the reset button. I quick and dirty modeled this little red X to fit in the existing recess and it worked on the first try and I think it looks great there.
I used PETG but PLA should work as well but may shrink a bit more and it is a good fit as it is.
.2 layer height
The author hasn't provided the model origin yet.