Koh I Noor Rapidograph. A tool I've struggled with in the past. I tried using Rapiographs while in college but I insisted in using the ink I had used for my crowquills, FW Speedball Acrylic India ink, which was too thick for the technical pen, too thick sometimes for the dip pens, and it would clog within moments of use. This time around I'm using Rapidograph ink which flows really smoothly from the pen. I'm on the second page and it's going great. I can sit there for ages and no pen dipping or burnt out Micron markers.
Above is panel one from page two, I'm hoping to be well into page three by tonight.