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How do I fill my eyedropper pen? The great thing about eyedropper-filled pens is they’re so simple! Uncap the pen and unscrew the section. Hold the open barrel upright to do this, of course. You can use a glass pipette if your pen was supplied with one, a plastic pipette, a syringe, or you can even pour ink in directly from a small container (if you’re careful). Fill the barrel nearly to full. Try to keep …