I lost my original diffuse piece when deep cleaning my controller, so I made my own. Hopefully this can help out anyone in the same situation.

Use as clear filament as you can find, here I used Inland Clear PETG+

This would probably come out cleaner on a resin printer, but I don't have one 

Print Settings:

Small layer height seems to work best

100% infill

Aligned rectilinear top and bottom surface