If you want super thin...
If you want super thin lines this is the pen for you (and me). My workhorse for
doodling and detail work. Not so good for sketching because of the scratchiness
of the needle-like point, though with the right paper you could make sketches
happen. The strength of this pen is the cartridge system which gives a nice
consistent flow of ink once you get it going. The biggest weaknesses are the
cap and body which are plastic and will not hold up to abuse - like keeping it
in your back pocket and sitting on it. The barrel is hollow so it will crack if
over-tightened. The clip on the cap will come off with repeated use (I
superglued mine back on).
This is a pen that requires some care: if you allow the ink to dry out then the
point will clog permanently(I have tried using the various cleaning
kits/solutions on my dried out points with no results). The good news is that if
you draw everyday with it and flush it with water after every cartridge change
it will reward you with about 1 - 2 years of faithful steady service. Make sure
the cap is screwed on tight after every use - it has a tendency to come loose at
the wrong moments.
Don't bother with the Koh-i-noor 0.13 mm (or even the 0.25 mm) - their ink
delivery system is terrible resulting in poor/no flow and the tip is even
scratchier than the Rotring. This is the best 0.13 mm pen. Ever.
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