Refills
3D pen refills, explained
Refills are where a cheap pen can quietly become an expensive one. The headline price is only half the story. Here is how to read the small print before you buy.
In short
- Kids' pens use PCL filament, usually 1.75 mm.
- Open refills can be bought from many suppliers at fair prices.
- Proprietary refills lock you into one brand's cartridges.
- Over a year, refill policy can cost more than the pen itself.
Open versus proprietary
This is the single biggest cost decision. Open-refill pens, like Pen'Up, take standard PCL filament that you can source from several suppliers. Proprietary-refill pens, like the 3Doodler range, require the brand's own cartridges. The cartridge model is convenient and tidy, but it ties your ongoing cost to one company's pricing.
If your child takes to the pen, they will get through a surprising amount of filament. A small price difference per pack adds up fast across a year of rainy afternoons.
What to check on the box
- Filament type: PCL is the low-temp standard for children.
- Diameter: 1.75 mm is the common size, so confirm it matches.
- Open or locked: can you buy refills from anyone, or only the brand?
- Pack price: work out the cost per metre, not just per pack.
A simple cost example
Imagine two pens that cost the same on day one. One uses open PCL at a fair market price. The other needs branded cartridges at a premium. After a year of regular use, the open-refill pen can easily be the cheaper to own, even if it looked identical at the checkout. This is why we weight refill policy heavily in our comparison.
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