I found a 3D printed fountain pen on Thingiverse and asked my dad to help me tweak it to fit a Hongdian #5 nib unit. Instead he helped me completely redesign it,
fountain pen feed" 3D Models to Print - yeggi
Free STL file Thingiverse logo turnable pen holder・3D printer model to download・Cults
castle pen holder" 3D Models to Print - yeggi
Hyperboloid pen holder by stuffperson - Thingiverse
Super Mario Pen/Pencil Holder by AndrewBougie - Thingiverse
Stabilo Stand (pen holder) by ZenziWerken - Thingiverse | Pen holders, Pen, Desktop cnc
Japanese Samurai Design Pen Stand with MakerBot Logo by Tomonori - Thingiverse
Little Box Pen Holder by Monkey3D - Thingiverse
voronoi pen holder by tomdavid - Thingiverse
Customizable Pen by LockheedMartin - Thingiverse
Please Sign In" Desk Sign and Pen Holder by shroppy - Thingiverse
Pen Holder by Silent_Bob - Thingiverse
Free STL file Pen holder for small CNC・3D printing model to download・Cults
Pen / Tool Holder by Hexagon - Thingiverse | 3d printing, Pen tool, Tool holder
Open 3D Fountain pen by Zoidberg38 - Thingiverse
Chameleon Pen Holder (High-Res) by PRIma - Thingiverse
Cubistand Pencil Pen Brush Holder Stand by sdmc | 3d printing, 3d printing art, 3d printing diy
just found this amazing pen holder on thingiverse! : r/3Dprinting
Telescopic Honeycomb pen-holder by tackoum - Thingiverse
Honeycomb desk organizer by stuffperson - Thingiverse | Desk organization, Planner pens holder, 3d printing
Pen Holder by damm301 - Thingiverse
Pen Holder by LKBrilliant - Thingiverse
