This is very interesting.
Here are pictures of a preliminary setup for creating rifling grooves in a piece of steel tubing by using a 3D printed spiral insert, lots of salt water and a battery charger. Electrochemical Machining is a process whereby metal is removed by passing an electrical current through a solution, the insert in this case exposing the specific areas to be 'cut' during the process. The results are quite interesting and certainly open up some possibilities for homebuilders.
The possibilities for creating complex metal parts in kitchen are fascinating, to be sure. I think getting the dimensions right would be a Thing for sure, lots of fiddling about to be done there.
The Dimensional, yet Deplorable, Phantom