based on:
G-Clamp fully printable by joehann on Thingiverse: [https://www.thingiverse.com/thing:1673030](https://www.thingiverse.com/thing:1673030)
(used his threads directly)

clamp designed with a fitting sleeve to compensate for printing orientation or any other inaccuracy, makes it stronger and gives it a perfectly tight fit.

the sleeve is also extremely simple to design and quick to print, so it can easily be adapted to any other diameter as needed.

depending on the length of the arm you're putting in it and how heavy the microphone you have at the end you will probably want it to be stronger. open the project in your slicer (BambuStudio or any other) and just increase the wall count to.
 

I am using this with a very short 60cm~2ft arm and a blue snowball microphone. anything heavier could probably crack the 5 walls of PLA.

Also Keep in mind that the screw gives you mechanical advantage so it's easy to tighten too far and bend/crack the part even before you put anything in the holder. A good indicator is to stop when you can't turn further with just 2 fingers. you can give it a tiny bit more preload after that.

These plastics are slippery on most surfaces and you cannot tighten it enough to add the friction to overcome that like you can with a thick metal clamp (though I made this model because the sheet steel one that came with the arm got bent and wouldn't hold it's original shape anymore). I would recommend adding something glued on the screw top and the clamp surface to add friction. what ever you have laying around the house that grips well to your table surface.

if you need it to be super well secured and absolutely sure it can't slip. use double sided tape maybe… I'm assuming that if you are here you don't want to screw a thing in your table top.