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MrkLch posted a topic in Fountain & Dip Pens - First StopDoes anyone know if there is a formula for calculating the maximum hole size of an ink cartridge without the fluid coming out? In this site I proposed the problem but nobody could find a solution. At the moment. https://physics.stackexchange.com/questions/412804/how-to-determine-the-maximum-size-of-a-hole-that-can-keep-ink-water-stay-in-an-i