The replacement for the 3D pen by Science4you is a practical and eco-friendly solution designed to extend the lifespan of your 3D printing pens. This refill includes a biodegradable filament spool with a length of 50 meters, ensuring ample capacity for creating various objects and projects without needing to replace the entire pen. Made in China, this refill is intended for users aged 6 years and up, making it suitable for children, hobbyists, and beginners interested in 3D modeling. The biodegradable composition of the filament offers a notable environmental advantage, enabling responsible printing without compromising the quality of the final product. Additionally, its spool format allows easy installation and quick replacement, maintaining continuity in creative or educational tasks. This 3D pen refill maximizes the original device’s functionality, delivering optimal material extrusion performance and precise results with every print. In short, it is an essential accessory that combines ease of use, sustainability, and functionality for those looking to keep their 3D pen operational with an environmentally friendly and easy-to-handle product.