Thermoplastic polyurethane

TPU filamentFlex, grip, seal.

TPU makes the parts other materials cannot: gaskets that seal, grips that grip, bumpers that survive being dropped. Print it slowly and keep the filament path short.

Process: FDM (filament)
Families: 2
SKUs: 3
Price: On request

Grades

The grades in this family.

Print settings and mechanical properties are published per grade. A colour change never alters these numbers.

TPU 95A

The flexible grade that behaves. Firm enough to feed through most extruders at sensible speeds, soft enough to seal a joint and take a hit.

Best for

Gaskets and seals
Grips, feet and bumpers
Cable strain relief

Watch out

Retraction is the enemy. Keep it under 1 mm and print slow before you print pretty.

Direct drive preferredDry storage

Print settings

Nozzle: 220–235 °C
Bed: 40–60 °C
Chamber: Not required
Speed: 15–35 mm/s
Cooling: 50 %
Drying: 60 °C / 6 h
Diameter: 1,75 mm

Print settings are the common starting window for this material class, not measurements. Calibrate with a temperature tower and a flow test on your own machine.

Properties

Shore hardness: 95 AISO 7619-1 · PolyFlex™ TPU95
Density: 1,20–1,24 g/cm³ISO 1183 · PolyFlex™ TPU95
Elongation at break: 551 %ISO 37 · XY · PolyFlex™ TPU95

Benchmarked on published grades: Polymaker PolyFlex™ TPU95 · Polymaker · 27/08/2026

TPU 85A

Properly soft. It squashes like rubber and springs back, which is the point — and the reason it needs a short, tight filament path and patience.

Best for

Soft-touch overmoulds
Vibration damping mounts
Wearables and prosthetic liners

Watch out

Buckles in the extruder above roughly 20 mm/s. Bowden setups are not worth attempting.

Direct drive extruderDry storage

Print settings

Nozzle: 215–230 °C
Bed: 35–50 °C
Chamber: Not required
Speed: 10–20 mm/s
Cooling: 60 %
Drying: 55 °C / 6 h
Diameter: 1,75 mm

Print settings are the common starting window for this material class, not measurements. Calibrate with a temperature tower and a flow test on your own machine.

Properties

Shore hardness: 85 AISO 7619-1
Density: 1,12 g/cm³ISO 1183 · PolyFlex™ TPU90 — nearest published grade
Tensile strength: 30,1 MPaISO 37 · XY · PolyFlex™ TPU90 — nearest published grade
Elongation at break: 592 %ISO 37 · XY · PolyFlex™ TPU90 — nearest published grade

Benchmarked on published grades: Polymaker PolyFlex™ TPU90 · Polymaker · 27/08/2026

The properties on this page are values published in the named manufacturers' data sheets, measured on their grades to the standard printed against each row — not measurements of a ZORVA spool. Use them to compare material classes, not as an acceptance specification.

Buy

In stock, by colour.

Each SKU carries its own batch number and Material Passport. Colours are named like tools, not like paint charts.

TPU 95A

Graphite

The default flexible. Grips, feet, seals — most TPU work starts here.

MatteOn request

TPU 95A

Arrival Lime

High-visibility flexible for bumpers and wear indicators.

MatteOn request

TPU 85A

Natural

Uncoloured, so it can be dyed — and so you can see the weld between layers.

TranslucentOn request

Questions

TPU, answered.

What shore hardness of TPU should I choose?

95A is the workhorse: it prints on almost any direct-drive extruder and still bends. 85A is genuinely soft and squeezes like rubber, but it buckles in the extruder above roughly 20 mm/s. Choose by how much the part must deform, not by how soft it sounds.

Can I print TPU on a Bowden setup?

Yes, with 95A or harder, speeds under 20 mm/s, retraction under 1 mm and a tightly constrained filament path. 85A on Bowden is not worth the attempt.

How do I make a printed TPU gasket seal?

Print it solid with concentric top and bottom layers, use a 0.6 mm nozzle so the extrusion is wider than the leak path, and over-compress by 15–20 % in the assembly. Layer lines are the leak, not the material.