Diaphragm spacer ring for Scubapro G250 regulator

This replaces the diaphragm spacer ring (11.190.117) on a Scubapro G250 regulator.

The little tabs on these rings tend to break after a few decades, who can blame them.

The old ones have a thickness of 1.4mm while the new spare parts SP ships are 1.8mm for some reason. So i've included both.  
Smoothing the top layer with a fine sandpaper (e.g. 1000 grit) after printing might be a good idea.

Printing instructions:

• Use 0.1mm layer height or less
• Use something like 8 top and bottom layers so the part is solid
• Use a smooth print bed/plate
• Use a material that can take the mechanical stress and has the required chemical resistance and flexibility. I recommend PETG.
• Do not use PLA!

This is not an official spare part and is not ratified under the EN250 or any other standard. Use at your own risk!