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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!
We have similar goals. I am not so concerned with having it modifiable, I'm working in NX and am not going to be making .prt files available. This pen is for me, and if others like it, so be it.
But making it almost entirely printed is also my goal. I'm using a Jinhao #6 feed, and a Fountain Pen Revolution #6 nib. No saying you couldn't use a JoWo, or a Jinhao, or a Bock #6 nib, though. I thought about cartridge converters, but thought it might be too difficult to print the connection interface. The Pilot Con-B squeeze converter could be a good option though, I think that has a bigger hole. I'm going with a latex sac because it seemed easiest to me.
I, also, hate pen kits. The all look identical, with their skinny little grip sections and tiny nibs blown out to a huge body. The nibs are always cheap, and the pens are always heavy.
What software are you using?
I'm just using good ol' fusion 360. I've tried learning like openCAD but tbh I'm not the biggest fan of it. I haven't really thought about the cart connection interface because I've been using schmidt nib units (just because I have a few lying around) and the interface is built into the unit itself and like, why reinvent the wheel? I'm more aiming to design a pen body rather than simply make a 3d printed pen just because I can
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.