Also, making custom heat pipes from China is really quick and inexpensive. We trial-ed some for one of our projects, all we had to do was send the CAD drawings, and they did the rest. The thing is that they didn't have to make tooling for samples-level of quantity, and thus it was very inexpensive to make for trying things out. The company we used is called Soodeco Metalworks, but we changed our design to have no cooling as it wasn't required, thus we never went mass production for it.