Pipe Mounted Swivel for Multifunction Arm

I really liked the Multifunction Arm design by RostaP, and immediately found a million potential uses. I used a few of the models which they created along with my own special touch to create an articulating light mount system over my basement workbench. This also made me realize that I have basically created a super sized set of "helping hands" at my bench, which can now be adapted to hold tools etc. The Multifunction Arm, or boom, is now mounted to a swivel that directly clamps to a 3" pipe. I tried to simplify the design, and optimize for printing. There are only three parts to the model, and no supports required.

I designed this to use 4 heat set inserts, which accept 4 M5 bolts.