This is a custom lid for a coke bottle (tested with a two litre bottle). It has 2 siphon tubes in the top for your use.
I designed this item as part of a drinks dispenser. One side of the siphon tube attaches to an air line. The other side has a tube that extends to the bottom of the bottle. Air goes in, liquid comes out (hopefully)
As im using a pressurised system to find the fluids from the bottles, I needed this to be as air tight as possible. I've found the best settings as follows.
Infill: 100 percent
Shells: 2 (or 3 might be better)
Layer Height: 0.1mm (I've printed successfully in 0.2mm too)
Movement Speed: 80mm/s
Once I have the completed part I discovered using some plumbers tape around the thread of the bottle, helps it to become air tight. I am pressurising bottles at around 5-7psi and this seems to be working fine.