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This is a felt tip brush pen. The tip, rather than a chunk of felt, is a bundle of fibers like a brush. These fibers conduct ink like felt (as opposed to natural bristle or hair which only have ink or paint on the outside). The fibers can be advanced or withdrawn into a collar, adjusting the length.
Minimally advanced, the fibers are held closely together and this essentially becomes a felt tip pen as regards line produced. As the fibers advance out of the collar and are longer, the line produced becomes more and more brushy. Different bristle firmnesses are available, just as with brushes - with the commonality that all become a magic marker when withdrawn into the collar.
This system will also help keep your brushes from getting all gnarly and stiff, because the fibers are withdrawn into the pen and capped after use and so spend their off hours bathed in a rejuvenating bath of ink.
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||If not baked already this should be. I picture the
withdrawing mechanism to work like a rag mop
with one of those fancy heads on it. Absolutely
doable and desirable!
||/like a rag mop with one of those fancy heads on it./
||//...and so spend their off hours bathed in a rejuvenating bath of ink//
||This sounds delightful, as does the invention - it sounds like a good starting point for an artist's multi-tool.
||Very good. I know they make a brush tipped marker but nothing adjustable like this.
||I have some of these, except the fibres don't withdraw - you just put the lid on, like a normal felt-tip. I think I bought them in Japan.
||I have one too (bought from a shop that brought
them from Japan), but it is now a couple of years
since I used it, and yesterday I discovered it has
mostly dried up.
||Regarding the fibre withdrawal mechanism - you can
get fibreglass pens for cleaning metal (they are sold
as watchmakers' tools - and possibly in other trades
as well). They contain a tight bundle of glass fibres,
and twisting the top of the pen either extends the
fibres (to make a long, flexible brush) or retracts
them (to make a very stubby, stiff brush). This
seems almost exactly what you need here.