I always used to make customised knobs in metal which had a knurled body with a piece of studding screwed and Loctited in place. It was good knurling practice and they looked fine until 3D printing came along.
I now have a variety of ‘styles’ for knob bodies modelled in Fusion 360. These have a hexagonal profile recess together with either a threaded hole or clearance hole modelled into them. A nut is Loctited onto the thread and then the thread with the nut in place SuperGlued into the 3D printed body.
As usual I’m all for an easy (a.k.a. lazy) way of doing things …. here is a Fusion image.

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