.22 Silencer

This stand alone is good for a .22 caliber. If you want to use this on 9mm, add a Neilson device. It's steel chamber will take the initial blast saving this that initial punch.
Without a Neilson device on 9mm, this may blow apart along the layers, about an inch and a half in from the barrel. May, might not if your layers are melted together well.
10mm hole through baffles and exit hole. 7mm hole at entrance. For this 7mm hole you will need a 15/32 drill bit, then tap it with a 1/2x28 tap.
The two on Amazon will run you about $25.
FYI, once you tap those threads, this is a suppressor. Form 1 this first. You can file online and pay your $200 stamp tax.
You do you though.

Print temp for me 205c.
Table temp for me 60c.
Cooling fan set at 20%.
100% infill, Gyroid pattern.
Print vertical, chamber end up.
No supports.
Skirt for adhesion.
Speed at 60.
I use an Anycubic i3 Mega S.
Lower cooling and a 5c bump on extrusion gave me very good layer adhesion. Looks layerless.