Simple Piston Fountain Pen

thingiverse

It's a proof of concept for the smallest possible and simple fountain pen with a piston mechanism. To use OpenScad, you'll also need the threads.scad library (dkprojects.net/openscad-threads/). Pen size and some features (like cup thread position) can be changed. The latest sources can be found here: https://github.com/sanja-byelkin/SimplePistonPen To make the pen with default configuration, you'll need: 1. A #6 nib (the standard nib size; any other nib, like Peter Bock or Jinhao, will work too). 2. An Ebonite feeder for Noodler's ahab/konrad pen or a self-made ebonite feeder with a diameter of 6.3mm. 3. Two o-rings for the piston (mine came from a set marked 2/3" - 1/2", bought in the plumbers section of a supermarket; see the photo; their external diameter is about 9mm, inner diameter is about 5mm, and they're about 2mm thick). 4. A bit of silicone grease. 5. Sandpaper or something else to polish the inside of the tube with a diameter of 9mm (I used sandpaper 400, 800, and 1500, and glued it to a printed cylinder using superglue, which I attached to a BBQ steak).