I recently had a prop with a 1.2m pipe as its core part I needed to make as seamless a joint as possible and had previously seen something like this so made on for my own use.
This is made for a 20mm pipe, M7 bolt and nut.

Simply print 2 of these insert a knut or 2 into 1 half and the bolt into the other.

Glue into place inside the pipe (a straight cut is imperative.

You now have a pip that can be screwed together and unscrewed for travel.