But I've taken to using a Pilot Metropolitan fountain pen more often anyway, and that's easily and cheaply refillable from a bottle of ink.
Wish they had a way of refilli g the inks on these pens. I wanted to try fountain pens but couldn't find archival quality ink (waterproof + smudge proof once dried) for them.
I like the ink of the Micron, overall the feel are similar enough that both are fine for me, but the Pilot simply lasts longer.
I've a set of both, and what I've found is that when unused for a while (despite being neatly capped) the Micron will simply dry out and stop working. I've almost never had this with the Pilot.
For oddball diameters and colors which I use rarely it's a nuisance.