Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer, industrial designer and, 3D modeler.
For some of my projects, I'm also doing the physical prototype too.
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years of experience working on various systems/devices across multiple industries, from concept to launch.
1 - it looks like a baionette coupler for air tubing
2 - will need some more info/dimensions or the exact model type
3 - the output file will be a high resolution stl file ready for 3d printing, but you should use sls or sla printer in high details plastic in order to have a good results (with fdm printers will don't get the expected results)
For any more questions, we could chat here, including the whole details of the project, final price, time frame, deliverables, etc, etc...
Regards
Bogdan