I spent the week building an EDM machine that looked like a 3D printer where the filament got replaced by copper wire so that I don't have to worry about running out of electrodes.

Machining with the wire worked without problems, but because the wire was slightly bent the resulting holes were not round and it also took quite long to cut pieces with a ∅1.38mm electrode diameter.

And so, after all the testing I've done so far, I would say that the 5x5 brass electrode can produce the most useful parts.

For further testing, I changed the machine to a vertical setup again and added a 2020 profile frame to the water tray for mounting the workpieces.

For doing useful work with the 5x5mm electrode I want to write a tool in which you can select "pixels" for machining so that you can create your workpiece like painting the squares on the pages of a college block (which are also 5x5mm).