Engineering Plastic Filaments for Functional 3D Printing

Great Plastics supports sourcing of PEEK, PPS, PI, PAI and PEI filaments for industrial 3D printing. Share your target grade, nominal diameter, tolerance and quantity. We will review the sourcing options and confirm the available specification, packaging, documentation and lead time before quoting.

Not sure which material or grade fits your printer and application? Share your processing conditions and part requirements for a material suitability review.

5

High-performance filament materials

1.75 / 2.85

Standard nominal diameters (mm)

±0.05

Tolerance (mm)

RFQ

Grade, diameter & supply confirmed per request

Selection path

Choose your enquiry route

Filament purchasing and finished-part enquiries are reviewed separately. Pick the route that matches what you need to supply, select or produce.

Natural PEEK filament spool, 1.75mm high performance thermoplastic 3D printing material for aerospace and medical applications

Custom Filament Sourcing

Source PEEK, PPS, PI, PAI or PEI filament to your material grade, diameter and tolerance. Ideal when you already hold a specification or run a stock program.

Material Selection Support

Not sure whether PEEK, PPS, PI, PAI or PEI fits your application? Send the operating conditions and printer capability for a material review before you buy.

High-performance PEEK 3D printed custom parts, impeller and circular ring workpiece for engineering applications

3D-Printed Part Enquiries

For functional 3D-printed plastic components, send a drawing or CAD file with your dimensional and performance requirements. Distinct from filament purchasing.

Material selection

Five high-performance filaments

We source these five material families only. Review each filament and link to its material page for grade guidance before you ask for a quote.

Natural PEEK filament spool, 1.75mm high performance thermoplastic 3D printing material for aerospace and medical applications

PEEK Filament

Polyether ether ketone. High heat, chemical resistance, strength and dimensional stability for demanding printed parts.

Grade / formulation
Unfilled; carbon-fiber / glass-fiber / wear-filled
Diameter / tolerance
1.75 & 2.85 mm · typ. ±0.05 mm
Colour / spool
Natural / black · 500–1000 g spool
Documents
Datasheet & batch record on request

Natural off-white PPS filament spool, chemical resistant and low moisture absorption thermoplastic for industrial FDM 3D printing.

PPS Filament

Polyphenylene sulfide. Chemical resistance, low moisture uptake and inherent flame resistance for engineering fixtures.

Grade / formulation
Unfilled; carbon-fiber-filled available
Diameter / tolerance
1.75 & 2.85 mm · typ. ±0.05 mm
Colour / spool
Black / natural · 500–1000 g spool
Documents
Datasheet & batch record on request

PI Filament

Polyimide. Extreme heat, vacuum and electrical stability for the highest-temperature printing requirements.

Grade / formulation
Printable polyimide (unfilled); specialist
Diameter / tolerance
1.75 mm typical · custom on request
Colour / spool
On request · ~750 g spool
Documents
Datasheet on request

Natural amber PEI Ultem filament spool, high temperature resistant and flame retardant thermoplastic for aerospace, electronics and industrial FDM 3D printing.

PEI Filament

Polyamide-imide. High strength, creep and wear resistance under load for demanding functional parts.

Grade / formulation
Polyamide-imide (custom filament)
Diameter / tolerance
Custom · 1.75 / 2.85 mm on request
Colour / spool
On request · custom spool
Documents
Datasheet on request

Dark amber PAI filament spool, high strength, wear resistant and high temperature thermoplastic for industrial FDM additive manufacturing.

PAI Filament

Polyetherimide. Flame, heat and electrical performance at a more accessible cost point for printed parts.

Grade / formulation
Unfilled polyetherimide
Diameter / tolerance
1.75 & 2.85 mm · typ. ±0.05 mm
Colour / spool
Natural / translucent amber · 500–1000 g spool
Documents
Datasheet & batch record on request

Engineering Plastic Filament Specifications

Reference filament specifications

Reference values below are drawn from documented high-performance filament ranges. Grade, diameter, tolerance and supply are confirmed against the requested configuration at RFQ.

Material Grade / formulation Nominal diameter Diameter tolerance Colour / formulation Spool / net weight Sourcing status
PEEK Unfilled; carbon-fiber / glass-fiber / wear-filled available 1.75 & 2.85 mm Typ. ±0.05 mm
(confirm per grade)		 Natural / black 500-1000 g spool Available to source — confirm grade ·
PPS Unfilled; carbon-fiber-filled available 1.75 & 2.85 mm Typ. ±0.05 mm
(confirm per grade)		 Black / natural 500-1000 g spool Available to source — confirm grade
PI Printable polyimide (unfilled) 1.75 mm typical Custom — on request On request ~750 g spool Custom sourcing review
PAI Polyamide-imide (custom filament) Custom (1.75 / 2.85 mm) Custom — on request On request Custom spool Custom sourcing review
PEI Unfilled polyetherimide 1.75 & 2.85 mm Typ. ±0.05 mm
(confirm per grade)		 Natural / translucent amber 500-1000 g spool Available to source — confirm grade

From Drawing to Delivery

From specification to confirmed order

Send us the drawing or the key dimensions, and we will work out the right material, the right starting stock and a price — usually within one business day.

  1  

Submit your target specification

Material, grade, diameter, tolerance, quantity and packaging — or your printing requirements if you are still selecting a material.

  2  

Confirm grade & sourcing availability

We confirm the grade, diameter, tolerance, spool format and documents against the requested configuration.

  3  

Review the quotation

Price, quantity, delivery timing and any minimum order requirements are reviewed together.

  4  

Confirm the order

The order is placed against the agreed specification, with the confirmed details recorded for the delivery.

Before We Quote, We Confirm

What you can verify before ordering

These are the concrete confirmations we work through with you, the deliverables that let you purchase with the specificatio n agreed.

Pre-quote specification confirmation

Grade, diameter, tolerance, spool, quantity and packaging are confirmed against your request before we quote.

Supply status & lead time per grade

Availability and delivery timing are confirmed for the requested grade and configuration.

Documentation per order

Datasheets, batch records or other requested files are confirmed as available for the selected grade.

Printing & part-fit review

Printing conditions and part function are reviewed where the application requires it.

What to Confirm Before Ordering

Match filament material to application and sourcing risk

Use this matrix to frame your requirements before an RFQ. The right filament depends on the operating environment and the printer that will run it.

Material What to confirm before ordering Sourcing route
PEEK Grade and fill; printer temperature and chamber capability; diameter and tolerance; supply and lead time Standard sourcing — confirm grade
PPS Resin/fill form; print temperature; nozzle wear; target specifications; supply and lead time Standard sourcing — confirm grade
PI Printable grade availability; processing route; printer temperature ceiling; lead time Custom sourcing review
PAI Filament availability; printing and annealing conditions; lead time Custom sourcing review
PEI Grade; chamber temperature; drying; bed adhesion; target performance Standard sourcing — confirm grade

Still comparing PEEK, PPS, PI, PAI and PEI for a specific application? Review material selection

Supply and machining routes

Choose the right route for your part

The best route depends on part geometry, quantity, tolerance and application. We review the options before quoting rather than defaulting to one process.

Custom Filament Sourcing

Buy PEEK, PPS, PI, PAI or PEI filament to your grade, diameter and tolerance for in-house printing. Confirm quantity, spool format, packaging and documentation needs.

3D-Printed Components

Send a drawing or CAD file for functional printed parts. Review build orientation, tolerances, layer direction and finish against the operating conditions.

CNC Plastic Machining

For precision, surface finish or volume where printing is not the best route. Confirm material stock and machined features per drawing.

Quality & Inspection

Dimensional Inspection For 3D Printing Filaments

Inspection scope is agreed per order. Confirm the items below when you request a quote. Routine checks are part of standard supply; drawing-defined and documented inspections are confirmed per order and are not automatically included in every batch.

  • Filament diameter & diameter tolerance
  • Roundness and ovality
  • Surface finish and visual defect check
  • Winding quality, spool alignment & tangle-free
  • Material certificate and batch traceability
  • First-article inspection documentation

Orders leave us bundled, with the ends protected, on pallets and stretch-wrapped, ready for sea or air freight.

Thermoplastic filament production workshop, industrial winding equipment for high performance PEEK PEI PPS 3D printing filament

Buyer questions

Frequently Asked Questions

PEEK, PPS, PI, PAI and PEI filaments are used for functional 3D-printed parts that must handle heat, chemicals, load, wear or electrical requirements — fixtures, housings, brackets, guides, insulators and prototypes where standard plastics are not enough.

PEEK and PI are commonly reviewed for the highest continuous-temperature requirements, with PPS and PEI as strong options depending on chemistry, load and cost. The right choice depends on the operating environment, part size and your printer’s temperature capability — share these for a material review.

Standard nominal diameters are 1.75 mm and 2.85 mm, with a reference tolerance of ±0.05 mm on documented high-performance filament. Confirm your printer’s required diameter and any tighter tolerance against the grade before we quote.

Custom diameters and tolerances can be reviewed for these materials where the grade and quantity support it, and PI and PAI are typically custom and extended-lead sourcing. Send the required diameter, tolerance and quantity so supply and lead time can be confirmed.

No. Datasheet values describe the polymer and filament. Final printed-part performance depends on print parameters, layer orientation, chamber conditions, part geometry and post-processing, and must be validated against your application.

For filament, send material, grade, diameter, tolerance, quantity, spool/packaging and documentation needs. For printed parts, send a drawing or CAD file, dimensions, quantity, operating conditions, critical tolerances and post-processing needs.

Printing suits complex geometry and small-to-mid runs; CNC machining suits precision, surface finish and larger or anisotropic-sensitive parts. We review geometry, quantity, tolerance and application to recommend the better route rather than assuming one process is always superior.

Send your filament specification or printed-part drawing

Whether you hold a filament specification and need a sourcing quote，

or you want a functional 3D-printed component reviewed, share your requirements.

We confirm material suitability, grade, diameter and route before quoting.