The original adapters fit my polymaker spools, but did not function for 3dxTech or Sunlu spools. 1kg 3dxTech spools barely fit and may rub a hair, but won't pull the dryer around.
The author remixed this model.
Took awhile to duplicate the threads. They seem to be ISO Metric M30x3.5 with an offset face for better FDM functionality.
Included step file of custom threads to give a starting point for other spools sizes.