>>7695095
Default "line" brush.
Dial down the ridiculous 100 stabilization.
Edit the brush by clicking the icon with 3 lines on the brush window. Set minimum size to 1.
Switch pressure sensibility between opacity and hardness to see which one you like the most.
I also set spacing to 0, but at size 3 I don't see any difference.

If you want to ink just disable pressure sensitivity on opacity and hardness.