The Pros and Cons of Using PP Filament in 3D Printing and Its Practical Applications

Polypropylene (PP) filament is gaining attention in the 3D printing community for its unique properties and versatility. While not as common as PLA or ABS, PP offers distinct advantages that make it suitable for specific projects and industries. This post explores the benefits and drawbacks of using PP filament, highlights practical use cases, and explains why someone might choose PP for their 3D printing needs.

Close-up of 3D printed polypropylene part with unique texture applied

What Makes PP Filament Unique?

Polypropylene is a thermoplastic polymer widely used in packaging, automotive parts, and consumer goods. Its appeal in 3D printing comes from several key characteristics:

• Chemical resistance: PP resists many acids, bases, and solvents, making it ideal for parts exposed to harsh environments.

• Flexibility and toughness: It offers good impact resistance and flexibility compared to more brittle filaments.

• Low density: PP is lightweight, which benefits applications where weight reduction is important.

• Moisture resistance: It absorbs very little water, helping maintain dimensional stability.

  
  

These properties set PP apart from more common filaments like PLA or ABS, which may lack chemical resistance or flexibility.

Advantages of Using PP Filament

Durability and Flexibility

PP filament produces parts that can bend without breaking, which is useful for functional prototypes or end-use components that require some give. This flexibility also helps parts withstand repeated stress or impact.

Chemical and Moisture Resistance

Parts printed with PP can handle exposure to water, oils, and many chemicals without degrading. This makes PP a strong candidate for containers, seals, or components used in chemical processing or outdoor environments.

Lightweight Parts

Because PP has a low density, printed parts weigh less than those made from other plastics. This is valuable in automotive or aerospace applications where reducing weight improves efficiency.

Food Safety Potential

PP is commonly used in food packaging and containers. While 3D printed parts require careful post-processing and certification to be food safe, PP filament offers a promising base material for food-related applications.

Challenges When Printing with PP Filament

Warping and Adhesion Issues

PP tends to warp during printing due to its high shrinkage rate as it cools. This warping can cause parts to lift off the print bed or deform. Achieving good bed adhesion requires specialized surfaces or adhesives, such as PP-specific build plates or glue sticks.

Limited Color and Finish Options

Compared to PLA or ABS, PP filament is available in fewer colors and finishes. This limits aesthetic choices for projects where appearance is important.

Printing Temperature and Equipment Requirements

PP requires higher extrusion temperatures, typically around 220–250°C, and a heated bed to reduce warping. Not all 3D printers can handle these conditions without upgrades.

Post-Processing Difficulties

Sanding, painting, or gluing PP parts can be challenging because of its chemical resistance and low surface energy. Specialized techniques or primers may be needed for finishing.

Practical Use Cases for PP Filament

Functional Prototypes and End-Use Parts

PP is ideal for prototypes that need to mimic the flexibility and toughness of final products. For example, manufacturers can print snap-fit connectors, hinges, or clips that require repeated bending.

Chemical-Resistant Containers and Components

In laboratories or industrial settings, PP parts can serve as custom containers, tubing connectors, or protective covers that resist chemical exposure.

Automotive and Mechanical Parts

Lightweight, durable PP parts can replace metal or heavier plastics in non-structural automotive components such as clips, fasteners, or interior panels.

Medical and Food Industry Applications

With proper certification and post-processing, PP parts can be used for food-safe containers or medical device components that require sterilization and chemical resistance.

Tips for Successful Printing with PP Filament

• Use a heated bed set between 80–110°C to minimize warping.

• Print on surfaces designed for PP adhesion, like polypropylene sheets or specialized build plates.

• Enclose the printer or use a draft shield to maintain consistent temperature.

• Adjust print speed to moderate levels to improve layer bonding.

• Experiment with part orientation to reduce stress and warping.

• Consider using a brim or raft to improve bed adhesion.

  
  

Why Choose PP Over Other Filaments?

Choosing PP filament depends on the specific needs of your project. If you require parts that combine flexibility, chemical resistance, and low weight, PP offers advantages that PLA, ABS, or PETG cannot match. For example, a custom chemical-resistant container printed in PP will outperform one made from PLA, which can degrade or absorb moisture.

PP also suits projects where repeated bending or impact resistance is critical. Its ability to flex without cracking makes it a better choice than brittle filaments for functional parts like clips or hinges.

Summary of Pros and Cons

Pro's	Con's
Flexible and impact-resistant	Warps easily during printing
Resistant to chemicals and moisture	Requires specialized print surfaces
Lightweight	Limited color and finish options
Potential for food-safe parts	Higher printing temperature needed

PP filament is a specialized material that rewards users willing to manage its printing challenges. Its unique properties open doors to applications that other filaments cannot serve well. Contact Outlaw Prototyping if you are interested in printing parts with this unique material!