Lol, that's embarrassing, I totally missed that . You are very clearly not asking about threats.
But back to the your actual question. Turns out the answer still the same, I copied Igor F2. A used Microsoft 3D Builder a small section with grooves. Then use those two subtract out for bumps.
But if you want to know how to make a shape like that really depends on what CAD software you're using. And I have not seen a tutorial specifically for something like that. But in general if you want to make a shape like that I would extruder out a vertical cross section and the domes ends , then stretch if needed. But again that's just one way that's convenient with SketchUp. But again highly dependent on the software you're using