Just a minor re-mix to join a male and female end for more versatility.
I reinforced the male threads.
I also included a 200, 160 and 110mm in addition to the 140mm arm.
I find it much easier to have my soldering iron stationary when I do electronics, so I designed a collar for a standard iron. You will need 2 3Mx10mm with nuts for the clamp.
I plan to a a tabletop base soon.
I will be adding some other parts....
I used 2 shells with a 0.6 nozzle to connect the reinforcement to the exterior walls.