

▲ 17 r/fountainpens
XL cartridge (~2.15 ml) to Sailor KOP idea
Who was concerned about the leakiness of the printed cartridges: on the left after printing (yep, there are leak issue on seam), on the right is the sealed version (after 48 hours of testing, there are no leaks issue).
u/Andrew_Lensky — 1 day ago