How to Use Refills and Concentrates with Your Pen System
By Schondsgn | Published: 2026-07-30
Category: How-to Guides
Learn how to choose, mix, and use pen refills and ink concentrates to customize your writing experience and keep your pens performing at their best.
Whether you're a daily writer or a collector, understanding how to use refills and concentrates with your pen system can elevate your writing experience. Refills ensure your pen always has fresh ink, while concentrates allow you to customize ink properties like color, flow, and lubrication. This guide covers everything from choosing the right refill to mixing your own ink concentrates.
At Schondsgn, we offer a range of precision-machined pens designed for easy refilling and compatibility with various ink systems. Let's dive into the essentials of pen refills and concentrates.
Understanding Pen Refill Types
Pen refills come in several standard formats: international standard cartridges, proprietary cartridges, and converters for bottled ink. For fountain pens, the most common are cartridges and converters. Ballpoint and rollerball pens use disposable refills that vary by brand and model. Knowing which refill your pen accepts is the first step to hassle-free writing.
For example, the The Machined Pen V2 - Inkball and Fountain Pen supports both inkball and fountain pen modes, each with specific refill options. Always check your pen's specifications before purchasing refills to ensure compatibility.
- International standard cartridges are widely available and fit many fountain pens.
- Converters let you use bottled ink, giving access to thousands of colors and properties.
- Ballpoint refills typically use oil-based ink, while rollerball use water-based ink for smoother writing.
How to Choose the Right Refill for Your Pen
Choosing the right refill depends on your writing style, ink preferences, and pen model. Consider factors like ink color, flow rate, drying time, and water resistance. For everyday writing, a medium-flow black or blue ink is versatile. For special projects, you might prefer a fast-drying or waterproof ink.
The Anodized Aluminum Faceted "Pocket Six" Fountain Pen is a popular choice for those who want a compact, durable pen that accepts standard cartridges and converters. Pair it with a high-quality refill or concentrate for a personalized writing experience.
- Match the refill size and shape to your pen's grip section and feed system.
- Test different ink brands to find the flow and color you enjoy most.
- Consider using a converter if you want to experiment with bottled inks and concentrates.
Using Ink Concentrates to Customize Your Ink
Ink concentrates allow you to modify the properties of your ink. You can add a few drops to adjust color intensity, improve flow, or increase lubrication. Concentrates are especially useful for reviving dried-out ink or creating custom shades. Always follow the manufacturer's instructions to avoid damaging your pen.
When mixing concentrates, start with small amounts and test on paper. Over-concentrating can cause clogging or feathering. For best results, use a clean converter or cartridge and mix in a separate container before filling your pen.
- Use distilled water to dilute concentrates if needed.
- Store mixed ink in a sealed bottle and label it with the date and ratio.
- Clean your pen thoroughly after using custom ink mixes to prevent residue buildup.
Step-by-Step Guide to Refilling Your Pen
Refilling a fountain pen is straightforward. First, remove the old cartridge or converter. If using a converter, dip the nib into bottled ink and twist the piston to draw ink. For cartridges, simply insert a new one until it clicks. Wipe any excess ink from the nib and grip section before writing.
For pens like the Engineered Plastics Inkball Pen Grip Sections and Tips, you can swap grip sections to change between inkball and fountain pen modes. This modularity makes it easy to switch refill types without buying a new pen.

- Always flush your pen with water between different ink colors or types.
- Use a bulb syringe or cleaning kit for thorough cleaning.
- Store refills in a cool, dry place away from direct sunlight.
Common Mistakes and How to Avoid Them
One common mistake is using the wrong refill type, which can cause leaks or poor ink flow. Always verify compatibility. Another is over-tightening the converter or cartridge, which may crack the pen. Also, avoid mixing different ink brands without testing, as chemical reactions can clog the feed.
Regular maintenance prevents many issues. Clean your pen every few refills, especially when switching inks. If you experience skipping or hard starts, the nib or feed may need cleaning or the ink may be too dry.
- Keep a log of which refills and concentrates work best with each pen.
- Use a pen flush solution for deep cleaning if water alone doesn't work.
- Store pens nib-up to prevent ink from pooling in the cap.
Mastering refills and concentrates opens up a world of customization for your pen system. Whether you prefer the convenience of cartridges or the flexibility of bottled inks and concentrates, Schondsgn has the tools you need. Explore our collection of precision pens and refills to find your perfect match. Ready to upgrade your writing experience? Check out the The Machined Pen V2 - Inkball and Fountain Pen for a versatile, refill-friendly design.



