how I can join two hollow tubes together so they will be able to be taken apart and put back together.
What kind of joint can I create and how to do it?
How best can I create either a small screw together joint or another type of snap fit joint.
A lap joint is the best method for aligning and joining two tubes. Assuming the tubes are rigid, I would use a bayonet design to lock and unlock the two tubes. Here’s a Q&D approach.