I have a Kickstarter project running, called the 'Tactical Marker' pen. In addition to printing, I also have a little machine shop, too. If this post is not allowed, I won't be offended if removed.
Maybe not for everybody, but maybe some :)
In addition to the Sharpie use, the Tactical Marker also has an option to use the Pilot G2 ink refill.
The ‘Tactical Marker’ is also available in “non-sparking’ Aluminum-Bronze, for use in high risk work environments!
Check out the 'Tactical Marker' project
https://www.kickstarter.com/projects/179537728/tactical-marker-pen
