This is a really simple diffuser for the ScreenBar. The lowest setting on the ScreenBar was still a bit too bright for me. You'll need to print two and either glue or melt them together. I personally used a soldering iron to melt them together as glue wasn't working super well. I printed mine in Prusament Pearl White and it's pretty much the perfect brightness when printed at 2MM for me. 

It should for the most part snap into place, but I used 2 small clear elastics to make sure it's a tight fit.