This is a 1mm thick diffuser for the special Daylight on a Matchstick PCBs sold by Alchemy3D.
Works great with mounts like the original ones or:
https://github.com/VoronDesign/Voron-Hardware/blob/master/Daylight/STL/Brackets_1515_x2.stl
https://www.printables.com/model/1116880-micron-r1-daylight-on-a-matchstick-mount-remix
https://www.printables.com/model/643904-angled-mounts-for-daylight-on-a-matchstick-voron-v
Use M3x8 BHCS to attach.
Use a Filament that can handle some heat and print with a layer heigt of 0.2.
The author marked this model as their own original creation.