Fug I just bought one of these not knowing it was disposable.

pull off the back of it , it should just pop off then u can put ink into the hole and it will fill it . then pop the cap back onto it. i have one of those .

it might take a little force to pull it out though, if you can pull it or you break the string off try pliers or your teeth but it will pop out.

oh one last thing i forgot, when you fill it hold it over something to catch the drainage from the tip cus it will leak for a little bit to get rid of excess ink, you only need to use a very small amount of ink in it.

>>2538891
>>2538896

I got that off but if you look in it looks like I'm looking at the bag of a cartridge? But I see what you are saying if you puncture that cartridge it would easily become an eyedropper type pen. But I definitely see how this is possible if I just cut it off to this cartridge so I can pull it out and fill it with a syringe.

>>2539001

*back not bag. Which I mean to say that once you pull the string piece out if you flip it over the ink doesn't just spill out, which sounds like what you are describing.

It's weird there seems to be no info online about this because this thing seems so much nicer than the pentel pocket brush and it seems odd to just throw it away.

>>2539006
just buy a refillable kuretake jesus, I have two and they're fucking A+ and almost the same price

>>2540134
The ink dries fast on the paper? And what about on the pen? I'm not OP, but genuinely curious. Does it comes with a cap?

>>2540299
yes and yes the no.7 & no.8 are both great and come with two cartridges(which actually both fit in the pen at the same time interestingly enough) just remember you have to buy the refillable cartridges separately.