Today Mk IV got ready.
After making the parts
It extrudes ABS very well.
For the first time I dared to bore a nozzle with a cheap 0.3 mm PCB drill on my drill press. The drill went through the brass without any difficulty.
The nozzle prints very well. Unfortunatly I broke my 1 mm center drill on Saturday, so I had to use and ordinary 3.5 mm drill for the inside of the nozzle.