TPU 85A vs 90A vs 95A Shore Hardness: Which Flexibility Do You Need?

What Shore A Hardness Actually Means

The Shore A scale measures resistance to permanent indentation — a blunt probe pressed into the material for 15 seconds. A value of 85A means the material yields noticeably under finger pressure; 95A barely gives at all without significant force. The jump from 85A to 95A may sound small, but in practice it spans the gap between a rubber band and a shoe sole.

All three hardnesses print on the same printers and use the same temperature ranges (roughly 200–250°C nozzle, 0–60°C bed across the materials in our database), but their mechanical behaviour diverges dramatically once the part leaves the printer.

TPU 85A: Maximum Flexibility

85A is the softest hardness widely available for FDM printing. The data shows exactly what that means in practice: 3DXTech 3DXFLEX TPU 85A reaches an elongation at break of 660% with a density of 1.19 g/cm³. AzureFilm TPU 85A also hits 660% elongation at a lighter 1.11 g/cm³. Bambu Lab TPU 85A pushes the highest elongation in our database at 700%, with an impact strength of 124.3 kJ/m².

The trade-off is tensile strength. BASF Ultrafuse TPU 85A measures 34 MPa tensile strength with elongation of 600% — but tensile strength of a highly elastic material is almost meaningless in the same way you'd evaluate a rigid plastic. What matters is how far it stretches before tearing, and 600–700% means the part will deform to multiples of its original length before failing.

Print settings for 85A are the most challenging of the three hardnesses. The material's softness makes it prone to buckling in the extruder, particularly in Bowden setups. BASF's 85A runs at 200–220°C with a 40°C bed; AzureFilm specifies 200°C minimum with up to 80°C bed. Direct-drive extruders handle 85A reliably; Bowden setups may need a shorter filament path or a dedicated flexible extruder upgrade.

Best uses for 85A

• Finger grips, tool handles, and ergonomic pads where the user wants tactile give
• Gaskets and seals that must conform to irregular surfaces
• Shock-absorbing bumpers that need maximum energy absorption
• Phone cases and protective sleeves that must be squeezed to remove
• Flexible hinges and accordion-style bellows

TPU 90A: The Balanced Middle Ground

90A is where flexibility meets functional rigidity. Bambu Lab TPU 90A shows 650% elongation at break and an impact strength of 124.2 kJ/m² with a density of 1.24 g/cm³ — noticeably denser and stiffer than its 85A sibling (1.18 g/cm³, 700%). Eryone TPU 90A hits 573.9% elongation with a heat deflection temperature of 70°C — the highest HDT of the three hardnesses in our database.

The extra stiffness compared to 85A means 90A can hold its shape when not under load, which is critical for parts like cable strain reliefs, flexible cable conduits, and snap-fit closures. A 85A snap-fit clip will often be too limp to engage with resistance; 90A provides the snap-back force required. The 90A material still compresses fully under a finger squeeze but springs back reliably.

Print settings for 90A are more forgiving than 85A. Bambu Lab specifies 200–250°C with a 30–35°C bed. Eryone runs at 200–220°C. The material is stiff enough to feed through longer Bowden tubes without buckling, though direct-drive remains more reliable for retractions.

Best uses for 90A

• Cable strain reliefs and flexible conduits that must hold a path, not just bend
• Snap-fit closures requiring a spring-back force
• Shoe insoles and orthotic supports where cushioning and support are both needed
• Vibration-dampening mounts that must stay in position under weight
• Flexible robot joints and compliant mechanisms

TPU 95A: Semi-Rigid Flexibility

95A is where TPU starts behaving like a tough semi-rigid material rather than a rubber. 3DJAKE TPU A95 reaches 55 MPa tensile strength with only 400% elongation and a flexural modulus of 23,500 MPa — orders of magnitude stiffer in bending than 85A. BASF Ultrafuse TPU 95A balances this with 44.2 MPa tensile and 661% elongation, proving that even at 95A, the elongation can still be extremely high depending on the formulation.

Elegoo TPU 95A measures 34 MPa tensile with 680% elongation and an impact strength of 124.8 kJ/m² — the highest impact strength in our TPU 95A dataset. Bambu Lab TPU 95A HF (high-flow variant) hits 27.3 MPa with 650% elongation and 123.2 kJ/m² impact, formulated specifically for faster print speeds. Anycubic TPU (95A standard) records 34.4 MPa tensile and 697% elongation at break.

Print settings at 95A are the easiest of the three. Bambu Lab's 95A HF runs at 220–240°C nozzle with a 30–35°C bed. 3DJAKE A95 prints at 200–230°C. BASF's 95A specifies 210–230°C and a 40°C bed. Most 95A filaments can be reliably printed with Bowden setups. The material is stiff enough not to buckle during feeding and requires minimal retraction tuning.

Best uses for 95A

• RC car tyres and skateboard wheels where grip and durability matter
• Protective cases for electronics where drop protection is the priority
• Living hinges on enclosures and tool organizers
• Drive belts and timing belt-style parts (especially with carbon-filled 95A variants)
• Wearable braces and orthotic shells where semi-rigidity is needed

Side-by-Side Comparison

Here are the key differences at a glance — based on representative data points from our database:

Printing Tips by Hardness

All three hardnesses share TPU's general printability challenge: the material is prone to stringing if retraction is too aggressive and to filament grinding if the extruder grips too hard. Here are the key differences in practice:

85A demands the most care. Its extreme pliability means even a short Bowden tube can cause the filament to buckle upstream of the hot end. BASF's 85A specifies 200–220°C — lower than many 95A materials — because higher temperatures reduce viscosity enough to run fine at slow speeds but increase stringing significantly. Print slow (20–30 mm/s) and disable retraction entirely, or use minimal retraction (<1 mm on direct-drive).

90A is the most forgiving for Bowden users willing to tune carefully. Eryone's 90A specifies 200–220°C — similar to 85A but with enough backbone to feed more reliably. Retraction of 1–2 mm on direct-drive is usually safe. Eryone TPU 90A's HDT of 70°C also makes it slightly more heat-tolerant in the part than either extreme.

95A prints most like a standard thermoplastic. 3DJAKE A95 runs at 200–230°C; Bambu Lab's 95A HF targets 220–240°C. Bowden compatibility is generally good. Retraction up to 3–4 mm can work without grinding. The Bambu Lab 95A HF designation is worth noting — "high-flow" formulations at 95A are specifically designed for faster print speeds without quality loss, with Bambu Lab specifying 200–250°C to accommodate the flow rate range.

The ESD and Specialty 90A Variants

Not all 90A materials are standard flexible filaments. 3DXTech 3DXSTAT ESD-TPU 90A (density 1.18 g/cm³, flexural strength 31 MPa) is an electrostatic-dissipative variant running at exactly 260°C, designed for electronics handling components. The 90A hardness in this context provides just enough compliance for printed trays and tool holders that grip PCBs without scratching, while the carbon-black loading provides surface resistivity in the ESD-safe range. It is not a general-purpose flexible material.

When to Use Which

The decision almost always comes down to whether you need the part to hold shape under its own weight. Place a 85A part on a flat surface and it will slump slightly; a 95A part stands rigid. If your part must maintain its geometry when not actively loaded — think gaskets that sit in a groove, wheel treads that hold a circular profile, or a flexible case back that snaps into place — 90A or 95A is the right choice. If the part is always under external load (grip pads, bumpers, squeeze-to-close lids), 85A's extra give pays dividends in feel and durability.

For anything that must print reliably on a printer you haven't tuned for flexibles — especially Bowden setups like the Ender 3, CR-10, or Neptune 4 — start with 95A. A successful 95A print gives you the confidence and tuning baseline to move to 90A or 85A if the application really demands it.