This is a PVC tube with a kicker DS35 3.5" driver. going into a 3" flange down to 1.5" then elbows.
The print was big of rme about 4.6" round and 1.2" tall with lots of material. I think my print did great. no banding other then the obvious layers. but they look and feel good in person. I ran at 0.3 layers, alum bed, some covers, no cooling. took about 3.5hrs at .35 infill

Things I was curious about and others might want to know.

Tolerance: I wanted a press fit and I sued solidworks and had about 0.01 slip fit and it really did work accurately. I would probably go up to .02 next time to relieve stress on model.

Pilot Holes. I was unclear of pilot hole size and cracking plastic. I went down 80% of the screw outer diameter and up 10% for the chamfer diameter. I think +/- 10% would work. It threaded nice with no splitting and that is right on the edge of the print.

Wall thickness and strength. I did .35 infill and 3/3 top bottom layers. The part feels solid and i have a .375" wall diameter hugging around the bottom. of the PVC. It feels sturdy only thing I notice with the slip fit and some strain relief the wall delaminates and split slightly. I think because my step design over the PVC has a lot of stress. I should have ribs on outside or taper to reinforce the wall.

This part was first shot and works. I think next one I could remove some material thin some things out and make it in under 3 hours.

As fo rthe speaker I did do some port sizing and I saw online with some long port length you can simulate base. My first pass and it was pretty true. I had a 14" port of 3/4" diameter curled up inside and amde huge differance. I tried speaker, speaker, with just baffle, speaker in pvc tubes, speaker with port and final one definitely has solid merit. And can handle some power too.

This was my test setup. Now on to real size of 6.5" for my party setup. I will finish these off for a home stereo setup