Search the forum for “Slot” for starters. It has been discussed here in several posts. There are some different takes on it.
Interesting configuration. Did you import that model into Shapr3D?
The main cylindrical body looks like it has a taper of about 5°, right?
I assume the central hole is straight through and not tapered to match the cylinder.
The helical cut out has some interesting compound contours as the cut out at the bottom has parallel edges. I’m able to reproduce but it may not be exact. I’ll have something to share in a short while.
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Thank you very much, now I see it, incredible and very elegant way to do it. Thank you very much.
Fernando Besa.
You may need to get your Scientific calculator out, as you have some Trigonometry to do.
In order to make this type of fixing work properly the faces of the slot must be perpendicular to the axis of rotation. This is so that the bayonet pins have maximum contact to spread the load.
The tool that is going to give you the right kind of slot is the ’ Revolve ’ tool.
The key to the revolve working is getting the size of the cutting shape right, for the angle of rise.
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I love this solution too, many thank to everyone,
Fernando.
With a little playing around, I have found that you can achieve the result with the loft tool as well. You do need at least four lofting shapes to get a decent and uniform curve.
After the first try, I looked at the original posts images more closely and noticed these cut outs.
And realized those were done to make rounded straight through.
After that I noticed the file name.
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Common to find them in antique computer cabinets. The kind that still had vacuum tubes.
I was kinda curious what the connected piece looked because forgot where I seen it.
At first I thought it connects with a ball, out of curiosity I printed it and it does work.
Most Dzus fasteners are just grabbing a springy wire. They’re common on aircraft and race cars for affixing removable body panels and such.
Yes, they were all over the place for a decade or two, largely where access was needed easily.
I have spent quite a bit of time testing and fixing legacy MIL and Commercial equipment. The trouble with some of the plastic quick release panel fixings, is that they go brittle over time and the pieces that break off end up where you don’t want them (Fans, hot parts, etc).
Fortunately DZUS were metal.
The number of times you go somewhere or get sent equipment that has panels held on by 2 or 3 fixings!! 
Oh…and when some git has rounded off the screwdriver slots 
After looking up DZUS I noticed the tear drop, the way we made it would just slip off.
Without knowing it was a DZUS fastener I assumed it was a piece to align the other part 90 degree.