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Thanks for the PETG help
(i.ibb.co)
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!
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