Asklemmy

I carry a Fisher Space Pen everywhere, but I switched its cartridge for Pilot Hi-Tec-C refills. It takes a little fiddling to get the refill in there, but once it's in it works great!

i use Mitsubishi roller balls, real nice and inky, great colours. I'm a lefty so can't really use fountain types.

Those Zebras that are, like, 1/8 of the volume of what the median pen in this thread is gonna be. I'm not here to pinch hoses 5x their cartridge diameter, half of their length hanging out for nothing, I'm just trying to write. Any non-zero thickness works for that.

I like the Muji aluminum fountain pen.

https://unsharpen.com/pen/muji-aluminum-body-fountain-pen/

Cheap enough that if it breaks or you lose it or some such, you won't be that upset, but writes wonderfully. It is nice to have a pen where you can choose your own ink, and it will accept either refillable cartridges or pre-filled cartridges.

The way the cap posts on the back of the pen is pretty unique as well.

TUL pens. Super durable as I click my pens from anxiety and I havent had one break on me. Write very smoothly too

Waterman