Reprapper Polypropylene PP Filament 1.75mm 1kg - Semi-Flexible Tough

In this review of the Reprapper Polypropylene PP Filament, the bottom line is simple: this spool is intended for makers and small-scale prototyping teams who need a durable, lightweight material for functional parts. The biggest reason to buy is its blend of toughness and low density, which suits parts that must flex without cracking. Our review found the filament prints cleanly when used with the included build sheet and careful settings, and it rewards those who need chemical resistance and a smooth surface on finished parts.

Key Features

• Exceptional toughness: The polypropylene formulation yields high tensile strength so parts like handles and lockable containers resist impact while retaining flexibility.
• Chemical resistance: The material stands up to common chemicals better than many PLA blends, making it suitable for functional applications that see light exposure to solvents or cleaners.
• Lightweight construction: Low density helps produce lighter prints that are useful for prototypes where weight is important, such as aerospace or automotive mockups.
• Includes PP buildsheet: Printing is easier when the supplied build sheet is used, improving first-layer adhesion for a material that otherwise can warp on large parts.
• Careful spooling and inspection: The spool is mechanically wound and manually checked to reduce tangles and extrusion interruptions during long prints.

Who It's For

This filament is best for hobbyists, engineers, and small shops that need semi-flexible, ultra-tough parts and are willing to use a dedicated build sheet and adjust printer settings. It works well for functional prototypes, clips, housings, and containers where strength and low weight matter.

It is less suited to casual users expecting plug-and-play behavior on any bed surface or to those who need perfectly rigid, high-temperature materials. Users without a suitable build surface or who cannot control warping on very large parts should consider other filaments.

Pros & Cons

Pros

• High durability and flexibility make it a reliable choice for functional parts.
• Low density produces lighter prints useful for weight-sensitive prototypes.
• Supplied build sheet and careful spooling reduce adhesion and tangling problems when used properly.
• Good surface finish and color consistency when printed correctly.

Cons

• Requires the special PP build sheet and can still warp on big parts without a heated environment.
• Some users report mixed quality on brittleness and issues like stringing if settings are not tuned.

Specifications

Material	Polypropylene (PP)
Diameter	1.75mm
Weight	2.2lb (1kg)
Tolerance / Layer	0.03mm (layer detail)
Color	White (example shown)
Extras	5pcs PP build sheet included

Our Verdict

The Reprapper Polypropylene PP Filament is a practical choice for users who need a semi-flexible, ultra-tough material and who will use the included build sheet and tune printer settings. It offers good value for functional prototypes and lightweight parts, though it asks for a bit more setup than standard PLA to avoid warping and stringing.

Frequently Asked Questions

Do I need a heated bed?
The filament can be printed without a heated bed but large parts tend to warp; a heated environment helps stability.

Is the build sheet required?
Using the supplied PP build sheet is recommended for reliable first-layer adhesion and to reduce lifting during the print.

Will it clog my nozzle?
Properly spooled and inspected filament reduces clog risk, but users should tune extrusion settings to minimize stringing and avoid nozzle issues.