PTFE M12 Printable Fitting

This is an M12 screw and matching nut design with an extra feature, it has a 4mm cavity hole. The cavity hole is intended to accept a 4mm PTFE tube. The PTFE inner diameter is 2mm. The PTFE tube can be used to pass 3D 1.75mm filament through it. You may ask the question, is this PTFE and printed hollow bolt approach as good as a PC4 pneumatic fitting? The answer is likely, not quite, but keep in mind, the fitting is not working under pressure, hence air leakage will be low. So you can expect goo