I have had the Noodler’s Ahab flexible fountain pen ($20) for a couple months and have tested it with Goulet Pen’s replacement nibs but hadn’t posted about the flex nib. As others…
REVIEW: NOODLERS AHAB FLEX NIB FOUNTAIN PEN
Fountain Pens for Artists: Noodler's Ahab
Fountain Pens for Artists: Noodler's Ahab
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Fountain Pens for Artists: Noodler's Ahab
The Noodler’s Ahab/ Konrad replacement nibs are compatible with the Noodler’s Ahab and Konrad fountain pens. This nib is untipped and non flex.
Noodler's Ahab / Konrad Replacement Nib - Untipped Non-flex
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Review: Noodler's Ahab Flexible Nib Fountain Pen - The Well