TWSBI Vac Mini Fountain Pen - Clear

The vac experience, without it being big

The TWSBI Vac Mini takes the full vacuum filling system from the Vac 700R and shrinks it into something far easier to carry every day. The fully transparent body keeps the demonstrator experience intact, letting you watch the ink level, filling mechanism, and even the ink sloshing around inside the barrel. Despite the smaller size, it still includes a shut-off valve for travel and a threaded posting system that turns it into a comfortable full length writer.

What sets it apart

• Vacuum filling system with surprisingly large ink capacity for the size
• Fully transparent body lets you see the ink level and mechanism clearly
• Compact when capped, but posts into a comfortable full length pen
• Reliable stainless steel nib shared with the proven TWSBI Eco platform
• User serviceable with included wrench 

Feel in the hand

The Vac Mini feels compact without feeling tiny. Posted, it becomes a genuinely comfortable writer, while the clear demonstrator body makes the ink part of the experience. You start paying more attention to what colours you fill it with because you’re seeing the whole system at work.

Who it’s for

• Writers wanting a portable vacuum filler
• Demonstrator fans who enjoy seeing the ink and mechanism at work
• Everyday carry fountain pen users
• TWSBI users wanting more ink capacity without moving to a larger pen
• People who like compact pens that still feel substantial once posted

Not for

• People who dislike posting smaller pens
• Writers wanting the lightest possible pocket pen
• Cartridge users who want zero maintenance
• Anyone wanting the simplest possible filling system

Practical tips

• Pull the rod out slowly and push in quickly to fill the pen
• During long writing sessions, open the rear blind cap slightly to allow ink to move past the shut-off valve

FAQs

Is it much smaller than the Vac 700R?
Yes, it’s noticeably shorter and more portable, but still substantial once posted.

Does it hold less ink than the Vac 700R?
Yes, but still more than most cartridge or converter fountain pens.

Can you use it unposted?
Yes, though many users prefer it posted for better balance and length.

Is it difficult to fill?
No, but it takes a little practice at first. We recommend doing the first fill with a cup of water, to both flush the pen and get a feel for the mechanism movement.

Is it difficult to clean?
Not really. Use the mechanism to expel any remaining ink, then do a few cycles of water into the pen to rinse out the barrel.

Can the nib be swapped?
Yes, compatible nib units are available separately. They screw on and are easy to exchange.

Does it come with ink?
No, bottled fountain pen ink is required.

Can I use it with document or shimmer ink?
Yes, but cleaning the barrel is not as easy compared to cartridge/converter and piston filler pens. 

Why did my pen stop writing?
For long writing sessions, you need to unscrew the end cap a few rotations to enable ink to flow. If the ink starts skipping, check you have undone the end cap enough.

What’s included

• TWSBI Vac Mini Clear Fountain Pen
• Presentation case
• Wrench
• Silicone grease
• Instruction leaflet
• Free tuning option from LarryPOST

Ink pairing suggestions

• Bright inks really show off inside the clear barrel
• Deep blues and black inks give it a cleaner, more technical look
• The transparent body makes ink choice part of the personality of the pen

Build your practice

• The Twsbi Vac20A Ink Well makes filling cleaner and less awkward
• Spare Vac Mini nibs are available to explore line width
• Pen flush helps you rotate heavily saturated inks regularly
• Pairs nicely with the Traveler's Co refillable notebook system

Specifications

• Brand: TWSBI
• Brand series: Vac Mini
• Launch: 2016
• Origin: Taiwan
• Nib: Stainless steel
• Nib sizes: EF, F, M, B, 1.1mm stub
• Filling system: Vac filler (2mL)
• Body: Transparent polycarbonate
• Trim: Stainless steel
• Cap: Twist
• Grip: approx. 9.5mm
• Diametre: approx. 13.5mm
• Length: approx. 123mm (capped)
• Length: approx. 145mm (posted)
• Weight: approx. 26g (capped)
• Comparable size: Pilot Prera, Pilot Kakuno, Pelikan M200