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The Good Blue

R615 Fountain Pen

Typical for The Good Blue
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A model in The Good Blue's fountain pen lineup. Specs below reflect the typical configuration across The Good Blue's core range.

A solid mid-range option once someone has decided fountain pens are a habit worth investing a bit more into.

Specs

Filling systemCartridge / converter (typical for most fountain pens)
Ink capacityVaries by model
Nib optionsF, M (steel, typical)
MaterialResin or metal
Typical priceVaries, check current listings
How long has your R615 Fountain Pen been inked?
Inktend counts the days and reminds you when it's time to clean.
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About The Good Blue

The Good Blue is a small London-based startup founded by a maker named Sunil, whose first flex fountain pens appeared in 2021. Its CNC-machined aluminum and brass pens, the R615 and L130, pair flexible stainless steel, titanium, or 14k gold nibs with a specially designed high-flow feed produced by UK laser sintering, and the pens are manufactured in the UK. The brand is known for bringing usable flex-nib writing to everyday pens for calligraphy, sketching, and journaling.

United Kingdom Founded Unknown
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How to fill the The Good Blue R615 Fountain Pen

Fill it two ways: snap in a pre-filled international cartridge for convenience, or use a converter (a small plunger or twist mechanism that installs the same way a cartridge does) to draw ink from any bottle. The converter route opens up the entire world of bottled ink, which is where most of the hobby's color variety lives.

Choosing a nib size

Nib size determines line width, not writing pressure: fountain pens are meant to glide, never press. Extra-fine (EF) suits small, dense handwriting and thin paper; fine (F) is the most broadly recommended default; medium (M) shows more ink character and shading; broad (B) and stub grinds favor bold, expressive strokes and calligraphy-adjacent writing.

Keeping it clean

A quick flush with cool water every time you switch ink colors, plus a full clean every 4 to 6 weeks of regular use, is enough to keep the nib and feed performing well. Inktend's cleaning reminder is tuned to a 21-day baseline and adjusts naturally to how often you actually refill.

Pairing inks with the R615 Fountain Pen

Because refills are quick with a cartridge or converter, this is a good pen for rotating through several colors rather than committing to one; sample vials work especially well here.

Shading Chromatography - Lagoon
Malevich
Wixarica - Kauyumari
Monarca
Turquoise
Monteverde

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Frequently asked questions

How do I fill the The Good Blue R615 Fountain Pen?
Snap in a pre-filled cartridge, or use a converter to draw ink from any bottle. The converter route is the cheaper long-term option.
What nib size should I get for the R615 Fountain Pen?
Fine (F) is the safest default for a first pen. Go finer for small, dense handwriting; go broader if you want more ink character and shading.
How often does the R615 Fountain Pen need cleaning?
Flush it each time you switch inks, and give it a full clean every 4 to 6 weeks of regular use.
Is the The Good Blue R615 Fountain Pen good for beginners?
It can work as a first pen if you're comfortable spending a bit more to start.

More from The Good Blue

TL
L130
The Good Blue

Specs reflect the typical configuration across The Good Blue's core lineup rather than this exact model. Check current listings before buying.