TWSBI Eco / 580 + 1.1 Stub Nib Unit

TWSBI Eco / 580 + 1.1 Stub Nib Unit

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TWSBI Eco / 580 + 1.1 Stub Nib Unit
  • TWSBI Eco / 580 + 1.1 Stub Nib Unit
TWSBI Eco / 580 + 1.1 Stub Nib Unit

TWSBI Eco / 580 + 1.1 Stub Nib Unit

The TWSBI Eco (or 580) fitted with a 1.1mm Stub nib unit is Inkwell's recommended step up for a hand letterer who has outgrown the Pilot Parallel Pen's fixed plate width — a swappable, piston-fill demonstrator pen that lets a customer build a small collection of nib grinds over time in a single body.
Refill Type

Piston mechanism, large ink capacity (Eco: ~1.6ml, 580: ~2.0ml)
Available Grades
Nib Material

1.1mm Stub, stainless steel, sold as a complete swappable nib unit
Body Material

Clear or coloured demonstrator resin, fully visible ink window
Additinal Spec
Origin

Designed in Taiwan, manufactured in China
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Taxes included. Shipping calculated at checkout.

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Shipping

Packaging: 

We know art supplies are fragile. All professional pair and boards are shipped in reinforced rigid flat mailers. No tubes, no folds, no crushed corners. 


Order Processing Times: 

Orders are processed within 1–2 business days - we always aim to dispatch all “in-Stock’ items within 24 hours..

Note: Orders placed after 2 PM GMT on Fridays will be processed the following Monday.

Domestic Shipping (UK):

Standard (2–4 days): £3.50 (Free for The Illustrator & Studio Master tiers).

Priority (1–2 days): £4.50 (Free for Studio Master tier)

International Shipping: 

We ship globally. Costs are calculated at checkout based on weight and destination. Please note that customers are responsible for any local customs duties or taxes.

Order Tracking: 

You will receive a tracking link via email the moment your tools leave our studio. 
Returns

30-Day Change of Mind: 

We offer a 30-day return window (exceeding the UK legal minimum of 14 days). Items must be unused, in original packaging, and in "as-new" condition.

Faulty Goods: 

In the rare event of a defect, you are entitled to a full refund or replacement within 30 days. We will cover all return shipping costs for faulty items.

Defective Nibs: 

Occasionally, a pen may arrive dry or a nib maybe scratchy. Contact us within 7 days of purchase with a photo/video of the issue and we will send a replacement immediately.

Exclusions:

Due to the nature of the product, unless faulty we cannot accept returns on opened markers or used paper pads returned.

Digital Goods: 

The "Birthday Palette" and other digital downloads are non-refundable once accessed.


How to Start a Return: 

Email studio@inkwellartsupplies.com with your order number. We aim to process all refunds to the original payment method within 5–10 business days of receiving the item
The Nib Safety Net

"Gravity Happens. We’ve Got You Covered."

We know the heartbreak of a fountain pen hitting the floor. As a member of our Creative Rewards, you don't have to worry about the 'tines.' If the worst happens, just send us a photo and we'll send you a 50% discount for a fresh start.

"The Nib Safety Net" – Terms & Conditions

  • Eligibility: This benefit is exclusive to active members of the Creative Rewards program at the time of the accident.
  • Coverage: The 50% discount applies strictly to accidental damage (e.g., dropping the pen) that renders the nib unusable. It does not cover intentional damage, loss of the pen, theft, or normal wear and tear.
  • The Claim: To activate your discount, you must provide a clear photo of the damaged nib and your original order number to oops@yourstore.com.
  • Limitations: This discount is valid for a one-time replacement per pen purchased and applies only to the cost of the replacement nib unit. It cannot be combined with other promotional codes or used for full pen replacements.
  • Availability: We will provide the discount for the exact nib model where stock is available. If the model is discontinued, we will offer a 50% discount on a comparable alternative nib unit.

TWSBI is known for transparent demonstrator bodies and piston-fill mechanisms at an accessible price point, but the real reason it earns this slot is the nib unit system: the nib, feed, and housing come as one self-contained unit that unscrews and swaps in seconds, with no special tools. Once a customer owns one Eco or 580 body, adding a 1.1 Stub nib unit doesn't mean buying a second pen — it means buying a second nib. That's a genuinely different value proposition from most stub pens, and it directly answers the progression gap left once a letterer outgrows the Parallel.

Honest Note:

TWSBI piston pens are not designed to be disassembled casually — over-tightening or repeated full disassembly of the piston mechanism can wear the seal over time. Customers should clean by flushing with water through normal fill-and-empty cycles rather than fully dismantling the pen unless genuinely necessary.

Who is it For?

  • Hand letterers who've outgrown the Pilot Parallel Pen's single fixed width
  • Anyone who wants to try multiple nib grinds without buying multiple pen bodies
  • Customers who want a large ink capacity for long lettering or journalling sessions without frequent refilling

FREQUENTLY ASKED QUSTIONS (FAQ)

Do I need to buy a whole new pen for each nib width?

No — buy the body once, then add nib units as needed. Each unit swaps in by unscrewing the old one and screwing in the new one; no tools required.

Eco or 580 — what's the difference?

The 580 has a slightly larger ink capacity, a faceted barrel, and a few additional finish options; the Eco is the simpler, slightly more affordable body. Both accept the same nib units, so the choice is really about size and finish preference rather than function.

Will the piston filling system work with any ink?

Yes — it's a standard piston mechanism that fills directly from any bottled ink, no cartridges or converters needed.

Works perfectly with....