The business end of the bending tool is the red-hot Nichrome wire running through the aluminum channel. That channel is used to protect the MDF and act as a spacer so that the wire doesn’t touch ...

Professional tools often hold mysteries that DIYers never ... (Okay, sure, you actually need the spikes and wire-bending holes, too. The spikes are for reaming cut pipes, which is pretty important ...

All the parts are 3D-printed, with two NEMA 17 steppers taking care of both wire feed and moving the bending head. It appears that the head has multiple slots for tools of different shapes.