How do I get this pen to work? Never used, filled it with ink, but

Ink Cartridges (Fountain Pen 101)

How do I get this pen to work? Never used, filled it with ink, but it wont write. Staedtler mars matic technical pen : r/pens

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I have a ball point pen with lots of ink inside, but the tip is dried up and it doesn't write. What can I do? - Quora

A Comprehensive Lamy Safari Fountain Pen Review

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I paid $129 for this pen and it's spoiled every other writing utensil for me

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Filling Systems: Pros and Cons of Piston Fillers, Vacuum Fillers, and Cartridge/Converter Fountain Pens — The Gentleman Stationer

How do I get this pen to work? Never used, filled it with ink, but it wont write. Staedtler mars matic technical pen : r/pens