The Pen That Made Me Fall Back in Love with Writing by Hand: My Honest Experience with the TWSBI Diamond 580 RBT Fountain Pen

I have been a stationery person my entire adult life. Notebooks, paper quality, the weight of a good pen in the hand — these things matter to me in a way I’ve long since stopped apologising for. But fountain pens had always felt like a step too far. Too much maintenance, too much fuss, too many variables. I’d been perfectly happy with my collection of fine-liner rollerballs and had convinced myself that was enough.

Then a colleague brought a TWSBI to a meeting and I watched her write with it for an hour and I went home and ordered one that evening.

What Changed My Mind

The thing that had always put me off fountain pens was the perception of complexity. Ink cartridges versus converters, nib widths, flow adjustment, cleaning routines — it seemed like a hobby within a hobby, requiring significant investment of time and knowledge before you could just sit down and write. I’d read enough fountain pen forums to know that the community takes these things seriously, which is admirable but also slightly intimidating if you just want a pen that writes nicely.

Watching my colleague use her TWSBI disabused me of most of those concerns. She filled it from a bottle of ink in about thirty seconds. She wrote with it continuously for an hour without a single skip or hard start. She didn’t adjust anything, didn’t fuss with it, didn’t treat it like a delicate instrument. She just wrote.

I asked what model it was. She said TWSBI Diamond 580. I asked if it was complicated to maintain. She said: not really, you flush it with water every few weeks when you change ink. That was the answer I needed.

Why the TWSBI Diamond 580 RBT Specifically

The TWSBI Diamond 580 RBT Fountain Pen in the extra fine nib was the specific configuration I chose, and I want to explain why each element of that choice mattered.

The Diamond 580 is TWSBI’s flagship piston-fill pen. Piston-fill means the pen has an integrated filling mechanism — you dip the nib into a bottle of ink, twist the piston, and the pen fills directly from the bottle. No cartridges, no separate converter to buy. The ink capacity is significantly larger than a cartridge pen, which means you write for longer between fills. For someone who writes a lot, that matters.

The transparent acrylic body is the feature that makes the 580 immediately distinctive. You can see the ink inside the pen — the colour, the level, the way it moves when you tilt the pen. It’s functional (you always know when you’re running low) and genuinely beautiful. The RBT colourway — transparent blue barrel with red accents — is one of the most visually striking configurations in the range.

The extra fine nib was the right choice for my writing style. I write small and I write a lot — I journal daily and take handwritten notes in meetings. An extra fine nib produces a line width that suits small, dense handwriting and works well on standard notebook paper without feathering. A broader nib would have required me to change how I write; the EF works with my existing hand.

I found it in the Fountain Pens and Pens collections, and also in the broader Writing & Drawing Instruments, Pens & Pencils, and Office Supplies ranges. It arrived two days after ordering.

First Fill and First Write

I filled the pen with a bottle of blue-black ink I’d bought on the same order. The piston mechanism is smooth and intuitive — dip the nib into the ink, twist the piston knob at the base of the pen, watch the ink draw up into the barrel. The transparent body made the whole process visible and oddly satisfying. I filled it in about forty-five seconds.

I wrote a sentence in my journal. The ink flowed immediately — no hard start, no scratching, no need to prime the nib. The line was clean and consistent, the extra fine tip producing exactly the precise, controlled mark I’d been hoping for. The pen balanced well in the hand — substantial enough to feel like a proper writing instrument, not so heavy that it caused fatigue.

I wrote three pages. I hadn’t written three pages in my journal in one sitting for months. The pen made writing feel like something worth doing rather than a functional task to get through.

Ten Months On — The Honest Verdict

I’ve been writing with the TWSBI Diamond 580 RBT daily for ten months. Here’s the honest report:

• It’s the pen I reach for first, every time. I have other pens — the rollerballs I used before, a couple of other fountain pens I’ve acquired since catching the habit. The TWSBI is the one that’s always on my desk, always filled, always the first choice.
• The nib has never skipped or hard-started. Ten months of daily use, multiple ink changes, the occasional period of a few days without writing. Every time I pick it up, it writes immediately. That reliability is the thing I value most in a daily pen.
• The maintenance is genuinely simple. I flush it with lukewarm water when I change ink, which is every four to six weeks. The process takes about five minutes. That’s the entirety of the maintenance requirement. The complexity I’d feared doesn’t exist in practice.
• I’ve filled it with six different inks. The piston mechanism makes ink changes easy and the transparent body makes it satisfying — watching a new colour fill the barrel is one of those small pleasures that sounds silly until you experience it. The pen has performed consistently across every ink I’ve used.
• My journalling habit has been consistent for ten months. I’d been trying to journal regularly for years with mixed success. Since getting the TWSBI, I’ve written in my journal every day. I’m not attributing that entirely to the pen — but having a writing instrument I genuinely enjoy using has removed the friction from sitting down and writing. The habit formed around the pleasure of the tool.

The Difference It’s Made

I write more. That’s the simplest summary. I write more in my journal, I take more handwritten notes, I write letters to people rather than sending emails. The TWSBI Diamond 580 made writing by hand feel like something worth choosing rather than something I did when a keyboard wasn’t available.

There’s also something about the quality of thought that comes with handwriting that I’d forgotten. Slower, more deliberate, more considered. The pen has given me that back, and I hadn’t realised how much I’d missed it.

If you’ve been curious about fountain pens but put off by the perceived complexity, the TWSBI Diamond 580 RBT is the right entry point. It’s not a beginner pen that you’ll outgrow — it’s a serious instrument that happens to be straightforward to use and maintain. Browse the full Fountain Pens collection and the Writing & Drawing Instruments range for more options.

Buy a bottle of ink at the same time. Fill it. Write something.

You’ll understand what the fuss is about immediately.

Eleanor Vane is a solicitor and lifelong stationery enthusiast based in Oxford. She has strong opinions about paper quality, a notebook collection that has outgrown its shelf, and is currently working her way through a bottle of Diamine Oxford Blue.