The cover is compatible with Suunto Vyper and Zoop (older version) diving computers.

The visibility is pretty good, especially in water.

Once I test it in a real dive I will post additional  photos.

I printed it with transparent PETG on a Prusa mini with the following settings:

Nozzle temp.:230 °C

Bed temp.: 85 °C

Layer height: 0.12 mm 

Perimeter: 1

Flow: 102%

Cooling: 0%

Print speed: 15 mm/s 

Infill: 100% aligned rectilinear

Top/bottom layers: 0

Settings are inspired by CNC kitchen video: