If you were ever as I annoyed that the Ender 3's LCD shines in the night with intensive blue light, this is something for you.
I created a simple holder for a piece of 3mm red acrylic plate which creates nice blue filter.
Tested and works great. The LCD is still nicely readable in the night without unnecessary blue wavelengths coming out
OpenSCAD file attached for customization.
Real Filament PLA