Prusament PETG Magnetite 40% Grey 1kg (NFC)

About PETG Magnetite 40% Grey

Prusament PETG Magnetite 40% Grey is a material with paramagnetic properties. This filament is suitable for making various electronic parts, such as switches, potentiometers, induction loops, electromagnetic shielding, etc. In hobby use, the material can be used for various tools that can be attached to a magnet. Another use can be found in art, design, and toys. Or, it can simply work as a weight.

Printing Setup

• Nozzle - 270±5 °C
• Heatbed - 100±10 °C
• Recommended Steel Sheet - Textured / Satin

Check Prusa's material table and print-surface preparation instructions before starting.

Basic Attributes

• Paramagnetic material - Requires hardened nozzle
• High density (heavy material) - Lower layer-to-layer adhesion compared to pure PETG
• Visually appealing matt black surface - Cannot be transformed into a permanent magnet under home conditions

New spools equipped with OpenPrintTag

Prusament filaments are wound on a redesigned spool that introduces several improvements for an even better printing experience, starting in October 2025. The new spool features a simple locking mechanism that makes disassembly quick and easy, allowing effortless refills. It also stays secure during filament drying, even at higher temperatures. And with its slimmer dimensions, the spool ensures compatibility with a wide range of multi-color and multi-material printing systems.

Every new Prusament spool now comes with a fully rewritable NFC tag powered by the OpenPrintTag standard. It’s designed to work across brands and ecosystems. It is free to use, free to extend, and open for anyone to build upon. Most importantly, it works entirely offline. All essential data is stored directly on the tag. Your printer can recognize the spool instantly, with no dependence on cloud services or vendor lock-ins. The OpenPrintTag attached to your Prusament spool contains essential data about the material and can be read with the Prusa mobile app.

Read more in our announcement article.

What can you expect?

Prusament PETG Magnetite 40% Grey is our own in-house made PETG filament filled with Magnetite powder. The whole manufacturing process is closely monitored and tested - we guarantee ±0.03mm precision.

You can inspect the parameters of every spool we made at prusament.com.

Prusament is produced by Prusa Polymers, with manufacturing checks throughout production.

Premium-Grade Materials And Thorough Testing The whole manufacturing process is closely monitored and tested – string diameter, color consistency, and mechanical properties – to make sure that every spool is perfect.

Prusa specifies a filament diameter tolerance of ±0.03 mm. Check the product notes for blend-specific tolerances.

Spool-level production data can be accessed through the QR code on the spool.

Read more about Prusament in the article at blog.prusa3d.com or Prusament.com!

Beginners tips & tricks

A hardened steel nozzle is necessary. The magnetite powder is a highly abrasive material and may damage brass nozzles.

The Prusament PETG Magnetite 40% cannot gain truly magnetic properties at home conditions. In theory, it is possible to magnetize the powder, however, this would require an extremely strong magnetic field, which would require highly specialized equipment.

Further setup guidance is available in Prusa's material table and technical articles.

Notes

Prusament PETG Magnetite 40% Grey is made in-house by Prusa Research.

1.75 mm filament is manufactured with a precision of ±0.03 mm.

To dry the filament, please follow the instructions in our article.