I made a bumper/visor for a Shearwater Petrel the other day. It might be handy for someone else.
I've included the Fusion 360 file in the Thingiverse download, so if you want to modify it you can. E.g. There's a name on the back of the visor, if you unsuppress that feature in the model, you can change the name to your name.
www.thingiverse.com
I dived it on saturday and it performed great.
p.s. The version in the photo isn't the version in the file. The newer on has been refined a little more.
p.p.s. I'm going to make a predator version as soon as I get the dimensions
I've included the Fusion 360 file in the Thingiverse download, so if you want to modify it you can. E.g. There's a name on the back of the visor, if you unsuppress that feature in the model, you can change the name to your name.

Shearwater Petrel Bumper and Visor by piggu
This case protects your Petrel from getting bumped. Also, here in Australia, it can get pretty sunny on your 3m deco stop, so this protects the screen from glare as well.The case is secured with a bungie that goes up through one of the holes and down through the other, so there are no knots on...

I dived it on saturday and it performed great.
p.s. The version in the photo isn't the version in the file. The newer on has been refined a little more.
p.p.s. I'm going to make a predator version as soon as I get the dimensions