Flexible Coolant Pipe Adapters

My never ending quest to find a lasting articulated arm design has finally ended. I regularly use the [PCB Workstation with Articulated Arms](http://www.thingiverse.com/thing:801279) to hold my PCB projects. Unfortunately, all of the arms I have made with printed ball and socket joints quickly loosen to the point where they can hardly hold their own weight. I have tried several ball and socket designs and many filament types and I can't get any arms to last. That is until I found out about flexible coolant pipe.

Flexible coolant pipe is used in the metal fabrication industry to spray coolant over a work piece while machining. The pipes must be liquid tight so the fit between the ball and socket is very snug. They also are made from a durable plastic without the striations that cause 3D-printed joints to wear so fast. The pipes can be bought from Ebay and other places for cheap. I got my pipes for less than $1 USD each including shipping. It is best to get the type without t