This adapter is designed to adapt the small 3/8"-16 screw on microphone stands to the larger 5/8"-27 on most microphone stands.
A proper metal adapter would be better, but if you don't have time and you need one, this will do the job.
I have increased the number of walls to 5 to make everything as rigid as possible.
I also enabled a horizontal expansion of -0.15mm to get a smooth thread. This value turned out to work with my printer, you have to find yours, just be careful not to force the adapter into the microphone holder!
[EDIT] I've added a new revision that cuts two sides of the external screw, in case you have trouble unscrewing it from the stand.
The product was designed by
GiulioLucio