Merge 2 tubes

OK, so You prefer last row

Do You already have any physical object of this type, like the one You want to print, do You print yourself or do You send files to be printed for You

Yes, to be the last one .
Now i searching for a cheap printer to print myself and put all them together the entire device ,not just the tubes,before i go to do it on cnc.
with the tubes after are done,are not ready, i have to twit them each such a tube and screw them all together.
peoples are tricking the nature," nature is simple in his doing, but complicated in his inside construction and functionality " said
physically i do it with my hands the entire tube ,fill it inside,and i see it how looks like in reality.for me now is easy to talk about it , for others no at all.

If You want to cut all final parts on cnc it would be good to have cad version of all parts, for best fit ?
You posted screen of openscad in previous posts, do You use it on daily basis?

EDIT:

BTW. This conversation is slowly drifting off topic in context of original post, and may have no value for wider audience, shall we continue via email ?

i will need before the cnc a cad program to put it together. i see it for the first on my search on the web o form which i need it in this tube, and i asked for help on the forum and particularly. iā€™m not skilled in math and do soft,openscad needs math.
we can via email if have fun in this project.