Product Description

Prusament PETG Magnetite 40% Grey 1kg is a technical filament developed by Prusa Research. It is a PETG filled with fine magnetite powder (~40%), which gives the material paramagnetic properties, significantly higher density, and an attractive matte grey surface.

Unlike standard PETG, this material is heavier, more abrasive, and behaves differently in a magnetic field. It is great for various electronic applications, functional prototypes, and mechanical parts that are meant to be attracted by magnets or need additional weight.

Note: The material is paramagnetic – it cannot be converted into a permanent magnet under domestic conditions.

Main Advantages

• Paramagnetic material – printed parts can be easily attached to magnets.
• High density and weight – suitable where a heavier part is desirable (weights, stabilizers, stands, etc.).
• Attractive matte grey surface – professional appearance, ideal for visible and design parts.
• Good dimensional accuracy and Prusament quality – tight diameter tolerances, uniform color and filling.
• High temperature resistance of PETG – suitable for functional prototypes and parts with higher thermal stress than PLA.

Limitations and Recommendations

• Requires a hardened nozzle – magnetite filler is highly abrasive and quickly wears out standard brass nozzles.
• Lower interlayer adhesion than pure PETG – higher nozzle temperature and careful print settings are recommended.
• Cannot be magnetized as a permanent magnet – used for interaction with magnets, not as a replacement for them.

Typical Use

• Electronic components and sensors Switch bodies, potentiometers, induction loops, transformers, sensors, electromagnetic shielding elements.
• Parts attracted by magnets Covers, lids, tools, and fixtures meant to be easily attached to magnetic panels, holders, or work surfaces.
• Magnetic boxes and storage systems Lids, partitions, or entire boxes fixed using magnets.
• Art, design, toys Components for magnetic levitation, puzzles, parts with an "anti-gravity" effect, unconventional decorations.
• Weights and stabilization elements Stands, bases, camera holders, light fixtures, or measuring instruments where higher weight in a compact volume is an advantage.

Recommended Print Parameters

Specific values may vary by printer and conditions; use these as default settings.

• Base material: PETG filled with magnetite (~40%)
• Nozzle temperature: approx. 270 ± 5 °C
• Bed temperature: approx. 100 ± 10 °C
• Recommended bed surface: textured or satin PEI sheet
• Enclosure: not required
• Print speed: medium to higher (according to printer capabilities)
• Part cooling: mild, according to PETG profile

Important: Use a hardened (steel) or otherwise hardened nozzle to prevent rapid wear.

Tips for Successful Printing

1. Print Surface Preparation
   • PETG has high adhesion – a cleaned PEI surface can stick too much.
   • It is recommended to use a release layer (e.g., glue stick or window cleaner on a cold plate) to avoid damaging the PEI.
2. First Layer Calibration
   • The higher density of the filament means it is advisable to slightly adjust the Z-offset and verify that the first layer is well pressed but not "over-squished".
3. Temperature Settings
   • For better layer adhesion, keep the nozzle temperature closer to the upper limit of the recommended range.
4. Post-processing
   • The material can be sanded (dry and wet sanding).
   • For the final appearance, we recommend gradually refining the abrasive grit.

Technical Specifications

Who is the Filament Suitable For

• Hobby and professional users who need functional parts interacting with a magnetic field.
• Electronics developers and prototypers – sensor housings, switches, shielding, component holders.
• Tool, fixture, and aid manufacturers – magnetic holders, organizers, jigs, assembly fixtures.
• Designers and artists – unconventional objects combining magnets, movement, and high weight.

Storage

• Keep the spool dry – ideally in a sealable box with silica gel.
• Protect from direct sunlight and high temperatures.
• For long-term storage, it is advisable to slightly dry the filament before printing in a filament dryer or a printer with a drying function.

Key Features:

• Special PETG filament filled with approx. 40% magnetite with paramagnetic properties
• Significantly higher density and weight compared to standard PETG – ideal for weights and stable parts
• Possibility of easily attaching printed parts to magnets (holders, boxes, tools)
• Attractive matte grey surface for professional-looking functional and design models
• Suitable for electronic components, sensors, shielding, and technical prototypes
• Requires a hardened or otherwise toughened nozzle due to high abrasiveness of the magnetite filler
• Good dimensional accuracy and print consistency thanks to Prusament manufacturing quality