Quote Originally Posted by CaptainObvious View Post
I've seen some similar ideas before, always thought it would be a good experiment to make some sort of attachment to the extruder that would hold a cylinder made of felt or similar that you could soak in ink of various colours.
It should be cheaper than tearing pens apart in the long run since you could refill the ink.... come to think of it I wonder if inkjet ink could be used.... come to think more of it I wonder if some sort of inkjet contraption could be used to paint the filament as it is fed so that the colour could be controlled for full colour prints; like nozzles around the filament as it comes into the hotend.
I was thinking that if the pen was carefully altered, it would not be difficult to add ink to keep it strong. The point of the pen almost seals against the filament. If that could be made to seal well, then you could go crazy and have actual liquid in the pen. The easy to get bulk ink on eBay is all water soluable and I don't think we want that in this case.