I tried just about every suggestion here, but still couldn’t get an airtight print. This is transparent PLA. I’m going to play with my speeds and overlap to try to get it clearer, but it was dimensionally accurate and completely sealed the first try.
Don’t look too carefully at the barrel, it’s just a hollow test one. I was able to eyedropper fill and test the grip section with it, but the OD is wrong, and there’s no real filling mechanism in it. That’s phase 2 of this project!
Fusion 360 looks like it has some nice surfacing abilities. That makes sense to use nib units. I don’t think my Adventurer 3 can print the small, fine threads of a nib unit, so I’m opting for an old school grip section you friction fit the feed and nib into.
I’ve been working on my model this week and instead of the stud filler, I am going for a Conklin style crescent filler. Just one more piece to design, and I’m ready to do some test prints. Ink sacs are in the mail.