I haven't pulled the trigger on my own printer, but I just finished a project using the printers at the local library. Well, for the tool head, I ended up using Shapeways to print stainless steel for strength, but the prototyping was done using the FDM printer. It's a tool to build IDC cables faster.
Here's a video of the first time I was using it. I was a bit tenative, and it was tough getting the wires lined up. I have since gotten much better at lining up wires and using the tool.