Needed: M8x60 Bolt. M8x30 Washer and standard M8 washers;
Tested on Scubapro Exodry 4.0;
Version on the photo is much more expensive than .stl model. I had modified the model while printing my own one. There had been reduced the bulk of model and there is too much space to reduce more, but it would be better if handler more oaky.
With 12.5% of infill you will have up to 240 grams of Filament. But, probably there also space to reduce infill up to 10%. My slice was 33.3% of infill.
Real Filament PLA