I've been designing my own test pens for a while now.
They feature sleek designs with replaceable ink cartridges (standard BIC pen guts).
This is close to the final design and my first time printing with Woodfill (on UMO+ 0.4mm nozzle).
I'm also attaching my Cura settings in case anyone needs them.
Edit 1: I did 2 "atomic pulls" as soon as it finished printing and the nozzle cleaned easily.