Gregory's ServerI would also like them to be made of something sturdy that feels nice to hold. maybe used copper tubing like from hot water pipes in US bathrooms (they use the really skinny stuff in older houses there and it ends up getting ripped out and throw away alot)
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 The most difficult part is the tip.  @GustavinoBevilacqua my ideal marker is openable from both ends and uses some standard screw dimensions so changing the tip is as simple as unscrewing them. maybe a nut on each end so as something to help unscrew them when they get all dried with sticky ink @liaizon Montana makes refillables, I think there are industrial companies that make other refillable markers - I know some of the graff ones are a little squishier so you can force a high volume of ink through the felt. Have you come across the enamel pens that you can pressurize by pushing on a little plastic bulb on the end? |
random internet image of the type of pipe I am thinking about. maybe the pipes are too thick tho. only good for realllly fat tip marker