I updated this model to use M2x10 thread forming screws. This is completely a personal preference modification.
If you want a full muffler and exhaust system please check out my page as it has all of this.
Full Exhaust System: https://www.printables.com/model/1014839-voron-24-cpap-hepa-carbon-filtered-exhaust-w-muffl
The author remixed this model.
Uses M2x10 Thread forming screws