Here’s the quick way to fill a Moonman fountain pen : identify whether your model is an eyedropper, cartridge/converter, or piston filler, then follow the matching method below. For the Moonman A1/A2-style pens, the cartridge route gives the largest ink capacity; for eyedropper models like the M2/Q1, ink goes directly into the barrel; and standard fountain-pen filling still applies to many Moonman models.

Cartridge or converter

  1. Unscrew the barrel.
  2. Remove the section or nib unit as your model requires.
  3. Insert a fresh ink cartridge, or attach and fill a converter with ink.
  4. Reassemble the pen.
  5. Wait a few minutes before writing so the feed can saturate.

Eyedropper fill

  1. Unscrew the section from the barrel.
  2. Make sure the pen has a proper O-ring and use a small amount of silicone grease on the threads if needed.
  3. Use a dropper to add ink directly into the barrel, stopping before the fill line or inner threads.
  4. Screw the section back on snugly.
  5. Let the pen rest briefly before use.

Simple tips

  • Do not overfill, or ink can leak when you reassemble the pen.
  • If you use shimmer ink, shake the bottle first so the particles are evenly distributed.
  • After filling, give the feed time to wick ink properly before the first stroke.

Which model you have

Moonman has multiple filling systems across its lineup, so the exact steps depend on the model rather than the brand name alone. A safe rule is to check whether your pen comes with a cartridge/converter, an O-ringed barrel for eyedropper use, or a piston mechanism before filling.

Meta description: How to fill a Moonman fountain pen depends on the model, but most use either cartridge/converter or eyedropper filling, with a few basic precautions to avoid leaks.