Being too cheap for a real fountain pen, but prefering the feel, I ended up with a number of these cheap disposable versions that I found at various places. Problem is that with the amount of writing I do these things last about two days. Therefore I needed to find a way to refill these things cheaply.
For this project you will need a number of items.
Empty Fountain Pen
Fine Grain Sandpaper
Vine Charcoal (charcoal without binder works best)
Small Drill Bit
Jar of Ink (only if you don't want to make your own)
Make sure that you seal the pen very well with the glue. This pen later exploded in my pocket.
Step 1: Opening the Pen
In this step we will be opening up the back of the pen so that we can empty and clean it out. The first thing to do is to pull off this dinky little end cap. A pair of pliers here work well, but make sure that you don't squeeze too hard. While you can still block off the pen, it's easiest to use the cap that's included.
Step 2: Opening the Reservoir
This type of pen has a sealed plastic bubble in the cylinder that contains the ink. A small drill bit would work here, but as I hadn't any on hand, a heated paper clip works as well. Make sure that the hole you punch is big enough for pouring ink into. Try not to burn you fingers on the paperclip either. You kind of need the nerves there to finish the rest.