April 16, 2026
Description
A fully 3D-printed fountain pen body designed to pair with widely available JOWO #6 nib units and Standard International converters. No proprietary parts, no expensive kits — just print, screw your nib unit, drop in a converter, ink up, and write.
Why this exists
Good fountain pens are expensive. Good customizable fountain pens don't exist. This design gives you a functional, comfortable writer you can print in any color or material your printer handles — and swap nibs or converters whenever you want.
Compatibility
Print settings (tested on Bambu Lab X1C / P1S)
What's in the files
Assembly
Takes about 2 minutes. Screw the nib unit into the grip section, thread the grip onto the barrel, insert converter from the back, cap it. Done.
What's coming next
This is the first design in a modular fountain pen system I'm building. Coming soon:
→ Pocket-size barrel variant
→ Oversize/cigar-shaped barrel
→ Kaweco Sport nib unit grip section
→ Magnetic cap option
→ Multicolor AMS-optimized editions
→ Clip variants (standard, roll-stop, deep carry)
Follow me if you want to see the full system develop — I'm designing toward a complete "build your own pen" ecosystem where you mix and match barrels, grips, caps, and clips for any nib unit you own.
Feedback on fit, tolerances, and what nib units you'd like supported next is very welcome in the comments. This project gets better with your input.
Non-printed parts you'll need
License: Personal use. Commercial license coming soon for makers who want to sell printed pens.
License:
BY-NC-SA
Rocka
