I am experimenting with very fine nibs! In the past, I used 0.2 and 0.3 mm technical pens. The I used disposable micron pens. I am getting bored with micron pens. I have hundreds of 005 still unused and hundreds more of half used pens. When using a micron pen, the lines become lighter halfway through the pen's life. I have noticed that the finest pen and ink artists who stipple very fine illustrations are using certain pens, much like the Rapidograph pens I used before. They are using refillable pens with interchangeable nibs. That could get tedious and I constantly had to dip the nibs in ultrasonic cleaners. I thought perhaps I will try going back to them. Last weekend I have been scouting the web for very fine nibs. I am so excited. I found the finest liners - 0.03 and 0.05 mm. Now is that insane? Yes!