Protective case for the OnePlus Watch 3 for use while playing airsoft or other activities that may damage the watch. 

Requires a sheet of 2 mm polycarbonate (sold as Lexan, Palsun, Makrolon etc.) from which you cut a ~47 mm circular piece. 
Use the included PolycarbonateCutGuide.stl and a pen to trace the correct size.

You can refer to this video for one method of how to cut polycarbonate with just a sharp knife: 
[https://www.reddit.com/r/airsoft/comments/dawllb/how_to_diy_lens_protector_from_2mm_polycarbonate/](https://www.reddit.com/r/airsoft/comments/dawllb/how_to_diy_lens_protector_from_2mm_polycarbonate/) - Please be very careful, the knife may slip and if so it should not hit you or anyone else. 

Print in the orientation shown in the image from the slicer. No supports, brim etc. required. Would recommend 100% infill and 0.20mm layer height. Use a type of filament that is slightly flexible, I used PBT but have also tried PLA and both work.

STEP file included if you want to make any changes.