This is a stand with a base diameter of 15cm for a doll's head with M16 thread and wig.

In addition to the 3D print, an M16 threaded rod in the appropriate length is required (individually depending on the hair length of the wig)

The hole has a generous tolerance, if this is too much for you, you can wrap the rod 2-3 times with blue or duck-tape. ( in the pictures you see, I used blue-tape)

The M16 nut in the base is a tight fit and must be threaded with heat.

The washer is used to take some of some pressure at the top, so the upper nut can be screwed tight.

When assembling, be careful not to over tighten, not because it could break, but I have found that the base will otherwise buckle a bit and the stand will be a little wobbly. ( just in case you're wondering )
However, the screws can be tightened very firmly to make the stand rock solid.

I printed the base in ABS and the washer in PETG.

The profile is designed for stability (high infill, many top/bottom layers and walls)

stability, tested with 60 and 80cm length