The first tests with the wire extension worked very well and gave me some ideas to improve the process.
The new wEDM extension will be easier to wire, more accessible and will have an adjustable wire guide and internal waterflow.
The ESP breakout board had some changes too. The software controlled Microstep feature is not used anymore and those pins are free for other stuff now. Also the one unused Inputpin is now exposed. All in all there are now two IO pins and one input only pin more available.