3D Printing Info

Filament comparison

PLA vs TPU 85A

Compare printing settings, strength, heat resistance, dated prices and sources.

PLA (standard) guideTPU 85A guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PLA comparisonsMore TPU 85A comparisons
PLA vs TPU 85A — documented properties and sources
PropertyPLA (standard)PLATPU 85AFLEX
Market snapshot
Listing priceUSD/kg; dated snapshots$19.74/kg median; $9.99–$32.99/kg across 24 dated product listings$89.89/kg median; $31.99–$106.05/kg across 6 dated product listings
Identity & Market
Base polymer / chemistryPoly(lactic acid), a thermoplastic aliphatic polyester from fermented plant starch[1][2]Soft thermoplastic polyurethane at 82–85 Shore A[3][4][5]
Densityg/cm³1.17–1.24 (ISO 1183)[1][6][2]1.11 (BASF Ultrafuse 85A) to 1.19 (NinjaFlex 85A), ISO 1183 / ASTM D792[5][3]
Typical priceUSD/kgMainstream 1 kg spools cluster near 20[7][8][9]1 kg-equivalent spools span 32–106; the middle of the market is about 90[10][11][3]
Price range across brandsUSD/kg10–33 across brands; budget house brands 10–14, premium European 26–33[12][13][14][15]32–106 across brands; Siraya Tech Flex TPU 85A 32 at 1 kg, add:north TPU Pro Matte 85A 72, Recreus Filaflex 82A 90 at 500 g, Proto-pasta Clear Flexible TPU 90, 3DXTech 3DXFLEX 85A 96, NinjaTek NinjaFlex 106[16][10][11][17][3]
Market availability1–5Ubiquitous, every brand and retailer[18][19]Available from several mainstream brands[10][16]
Spool sizes & diameters1.75 and 2.85 mm; 0.75, 0.85, 1 and 1.1 kg spools plus spool-less refills[7][20][21][14][22]1.75, 2.85 and 3 mm; 0.5, 1 and 2 kg spools[10][16][3]
Typical applicationsConcept models, functional prototypes, low-wear toys, jigs used at room temperature[23]Soft-touch grips, seals, wearables and anything that must compress and rebound[3][4]
Diameter tolerance± mm±0.02 (Prusament) to ±0.03 (Bambu Lab, Prusa Research standard)[1][7][24]Not documented
Printing Parameters
Nozzle temperature°C190–230; Prusament specifies 210 ± 10[1][6][2]200–220 (BASF Ultrafuse 85A, 210 typical)[5]
Bed temperature°C25–60; Prusament 40–60, Bambu Lab 35–45[1][6][2]40 (BASF Ultrafuse 85A)[5]
Enclosure / chamber requirement1–5Open frame is fine[6][18]Open frame is fine[5]
Part cooling fan100 % from the second layer; reduce on the first one or two layers for bed adhesion[1][19]Not documented
Bed surface & adhesion aidSmooth or textured PEI, glass or painter's tape; glue stick only where release is a problem[6][25][19]PEI sheet or painter's tape; Polymaker warns TPU can over-stick and advises a glue stick as a release agent[26][27]
Maximum volumetric flow (mm³/s; see test conditions)mm³/s12–20 (PrusaSlicer max volumetric speed guidance for PLA)[28]1.2–3.2 at the 15–40 mm/s BASF specifies on a 0.4 mm nozzle at 0.2 mm layer[5]
Warping tendency1–5None[29][18]None[5]
Bed-adhesion difficulty1–5Sticks to anything — glue only needed on smooth PEI[6][2][19]Sticks to anything — Recreus states its 82A grade has excellent bed adhesion without a heated bed or additives[4]
Stringing / oozing tendency1–5Slight — 1–3 mm retraction handles it; oozing rises with nozzle temperature[6][19][30]High — drying plus tuning needed[31][27]
Overall printing difficulty1–5Beginner — prints on any machine out of the box[18][19]Advanced — enclosure, hardware upgrades, tuning; at this hardness the filament will not push through a Bowden tube[3][4]
Extruder requirementAny extruder; Bowden and direct drive both fine, no hardware upgrades[18]Direct drive only. NinjaTek calls its 85A grade ideal for direct-drive extruders and Recreus specifies direct-drive printers for 82A; BASF caps print speed at 15–40 mm/s with a nozzle of 0.4 mm or larger[3][4][5]
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely[18]Brass fine indefinitely[32]
Abrasiveness1–5Non-abrasive[29][18]Non-abrasive[32]
Nozzle clog risk1–5Very low[18][19]High — jams from moisture, heat creep or particles[31][27]
Heat-creep / jam sensitivity1–5Moderate — good heatbreak cooling needed; softens below 60 °C so it deforms in a warm cold zone[25][33]Very high — softens in the cold zone readily; soft filament buckles between the drive gear and the melt zone[27][3]
Hotend requirementAny standard hotend; PTFE-lined is fine at PLA temperatures[18]No special hot-end required, but a direct-drive extruder is (Simplify3D)[26]
Other hardware wearNone — brass nozzles and standard drive gears are unaffected[29][18]Not documented
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Moderate — 0.40–0.51 % saturated at 23–25 °C and 55–70 % RH[2][6][34]Moderate — NinjaTek measures 0.22 % in 24 h (ASTM D570) and BASF specifies a 70 °C dry for at least 5 h[3][5]
Equilibrium moisture content at ~50 % RH%0.43 saturated at 25 °C / 55 % RH (Bambu Lab); 0.51 equilibrium (Polymaker)[2][6]0.22 after 24 h water immersion (NinjaFlex 85A, ASTM D570) — an immersion figure, not an equilibrium moisture content at 50 % RH[3]
Drying temperature & time50–55 °C for 6–8 h in a forced-air dryer; 45 °C for 12 h in the Bambu Lab AMS HT[6][2][33]70 °C for at least 5 h in a hot-air dryer or vacuum oven (BASF)[5]
Symptoms when wetBubbling and popping at the nozzle, stringing, rough surface and weak layers[31]Bubbling and popping at the nozzle, stringing and a rough surface[31]
Effect of moisture on strengthPolymaker rates PLA low-sensitivity — it absorbs moisture slowly and the loss shows as poor layer adhesion and brittle layers rather than a published strength figure[31]Polymaker groups TPU with the highly hygroscopic materials; wet TPU prints with poor layer adhesion and weak, brittle layers[31]
Storage requirementSealed with desiccant below 20 % RH; shelf life at ambient is long[2][19]Sealed with desiccant; often kept in a dryer during the print[31]
Mechanical Properties
Tensile strength (XY)MPa35–52 (printed XY, ISO 527); 55 mean across 16 brands and 53 for the reference PLA in a later run, both on 4×4 mm printed bars[1][6][2][35][36]26 ultimate (NinjaFlex 85A, ASTM D638)[3]
Young's modulusMPa2300–3427 (printed XY, ISO 527)[1][6][2]12 (NinjaFlex 85A, ASTM D638) — two orders of magnitude below any rigid filament; NinjaTek's 95A Cheetah reaches 26 by the same method[3][37]
Elongation at break%6.3–12.2 (printed XY, ISO 527); Prusament quotes 2.9 at yield[6][2][1]650 at break (Filaflex 82A) and 660 (NinjaFlex 85A); BASF measures 600 in XY and 320 in ZX[4][3][5]
Flexural strengthMPa76–87 (printed XY, ISO 178); Fiberlogy quotes 81 by ASTM D790[1][6][2][38]Not documented
Flexural modulusMPa2750–3230 (printed XY, ISO 178); Fiberlogy quotes 3800 by ASTM D790[1][6][2][38]Not documented
Charpy impact, notchedkJ/m²3.3–7.9 (printed XY, ISO 179, notched)[6][2]Not documented
Other impact dataCharpy unnotched, printed: 13–14 (Prusament, ISO 179-1), 26.6 (Bambu Lab PLA Basic)[1][2]Not documented
Layer adhesion / Z tensileMPa17–31 (Prusa interlayer test and printed Z tensile); 23 mean on My Tech Fun 4×4 mm bars[1][2][36]Not documented
Brittleness1–5Brittle — snaps with little warning[25][29]Very ductile — bends far before failing[3]
Hardness (scale-specific)Shore A / Shore D / Rockwell81 Shore D (Prusa Polymers in-house method); 75.3 Shore D measured on printed bars (My Tech Fun, Sunlu PLA)[1][39]29 Shore D / 85 Shore A (BASF Ultrafuse 85A, ISO 7619-1); 85 Shore A (NinjaFlex, ASTM D2240); 82 A nominal for Filaflex[3][5][4]
Creep resistance / sustained load1–5Poor — deforms under load at room temperature; 12 mm bar sagged to 20.3 mm over 5 days at 1.25 kg[40][41]Poor — no 85A creep test; a printed 95A TPU bar crept from 74.5 to 82.7 mm over 5 days at 1.25 kg, and softer grades creep more[42]
Fatigue / repeated-flex resistance1–5Poor — 38 000–49 000 cycles at 30 % of tensile strength, against 79 000–193 000 for PETG (printed, R = 0.2, 7 Hz)[43][25]Excellent — living hinges viable[27]
Elasticity / flexibility1–5Rigid[29]Rubbery / highly elastic[3][4]
Z strength as % of XY%77–89 on TDS specimens; ≈44 on My Tech Fun 4×4 mm bars[6][2][36]53 — BASF measures 320 % elongation at break in ZX against 600 % in XY[5]
Wear resistance & frictionNot documentedAbrasion 0.08 g mass loss over 10 000 cycles (NinjaFlex, ASTM D4060); 82 mm³ (BASF, ISO 4649)[3][5]
Thermal Properties
HDT at 0.45 MPa°C55–60 (ISO 75, 0.45 MPa)[1][6][2]Not documented
HDT at 1.8 MPa°C54–58 (ISO 75, 1.8 MPa)[1][6][2]Not documented
Glass transition (Tg)°C55–61 (DSC)[1][6][2]Not documented
Melting point / Vicat°C145–160 peak melt (Prusament, ISO 11357); 150 and 160 by DSC (PolyLite, Bambu Lab); Vicat 57–63 (ISO 306)[23][6][2]216 melting (NinjaFlex 85A, DSC)[3]
Continuous service temperature°C50–55 — loaded bars begin to move at this temperature[29][36]Not documented
Annealing responseBambu Lab conditions specimens at 55 °C for 8 h; annealing at 50–60 °C for 6–12 h raises crystallinity but can warp parts[2][44]Not documented
Thermal expansion (CTE)µm/m·K96 ± 5 at 0° and 99 ± 5 at 90° raster (printed PLA, fibre Bragg grating, 25–50 °C)[45]Not documented
Flammability / UL 94Flammable; no UL 94 rating published by the major brands[2][6]Not documented
Environment & Chemical
UV resistance1–5Degrades within weeks outdoors[25][23]Good — years with some colour shift; Polymaker lists UV exposure among the conditions TPU withstands[27]
Outdoor durabilityNot suitable for long-term outdoor use — UV embrittlement plus softening above 55 °C in direct sun[23][25]Not documented
Chemical resistanceGood against weak acids, oils and grease; poor against strong acids and alkalis; dissolved by chloroform, THF and hot benzene[6][25]Withstands industrial solvents and UV exposure (Polymaker)[27]
Water / humidity resistance in service1–5Good — insoluble in water, absorbs 0.4–0.5 % at equilibrium[2][46]Not documented
Food contactBase resin is food-contact grade and EN 71-3 certified by some brands, but printed layer grooves harbour bacteria; Prusa advises against food use[25][46]Not food safe without specific certification (Polymaker)[27]
Biodegradability / compostabilityIndustrially compostable only — needs sustained 55 °C and specific microbial conditions; not home compostable[46][25][2]Not biodegradable[27]
RecyclabilityMechanically recyclable; not accepted in household plastic collection, so brand take-back schemes are the practical route[46]Not accepted in household plastic collection[27]
Health & Safety
Fume toxicity1–5Low hazard — minimal VOC and particle emission[47]Low hazard — minimal VOC and particle emission; TPU was not among the nine filaments in the chamber study[47]
VOC emission rateµg/min4–5 lactide, the dominant VOC (chamber study, three printers)[47]Not documented
Ultrafine-particle emission rateparticles/min≈1 × 10⁸ median across three printers; only laywood ≈8 × 10⁷ and laybrick ≈6 × 10⁷ were lower[47]Not documented
Hazardous species emittedLactide (3,6-dimethyl-1,4-dioxane-2,5-dione) dominates; no styrene or caprolactam as a leading species[47]Not documented
Ventilation / filtration requirement1–5None needed in a normal room[47]Open a window / occasional ventilation[47]
Post-Processing
Sanding & machiningWet sanding — dry sanding heats the surface by friction and smears it[23][25]Difficult to sand or smooth; Polymaker limits post-processing to trimming or tumbling[27]
Gluing & solvent weldingCyanoacrylate for most joints; some grades partially dissolve and bond with acetone, depending on additives and colour[25][24]Cyanoacrylate bonds TPU; no common solvent welds it[27]
Vapour / chemical smoothingNo practical vapour smoothing — only chloroform, hot benzene or THF, which are laboratory-only[25]No practical vapour smoothing[27]
Support material pairingPolySupport and PolyDissolve S1 (Polymaker); Support for PLA (Bambu Lab)[6][2]Polymaker warns TPU supports are often very difficult to remove[27]
Dimensional accuracy & detailGood — low shrinkage and features under 0.2 mm resolve; 55° overhangs and 30 mm bridges[29][2][19]Not documented
Solvents & Solubility
Soluble inChloroform: 10 % w/v in 2–4 h at 23 °C, every grade and morphology; THF and DMF only at 65 °C. Laboratory reagents.[48]DMF, DMSO, NMP and THF dissolve TPU; acetone, MEK and cyclohexanone are partial solvents. All laboratory reagents.[49]
Softened or crazed byAcetone, ethyl acetate and toluene plasticise it but dissolve <1 % even at 65 °C; submersion in acetone crazes and destroys parts.[48][50]Toluene and benzene swell it up to +50 % by weight at 23 °C; esters swell it severely; ethanol and IPA soften it.[49]
Solvent welding & smoothing agentChloroform vapour smooths and welds PLA at the cost of tensile strength; acetone does not smooth it at all.[51][50]None practical — the true solvents (DMF, THF, NMP) are laboratory reagents and leave the joint swollen and weak.[49]

Material entries describe families or representative grades, not an interchangeable specification for every spool. Test methods, orientations and conditions may differ. Unknown values are marked “Not documented”. Prices and source dates remain historical snapshots; check the linked guide for product details. Differences highlight text, not a universal winner.

Sources for this comparison

  1. Prusament PLA Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  2. Bambu Filament Technical Data Sheet V3.0 — PLA Basic Bambu Lab · 2026-08 · tds
  3. NinjaFlex 85A Technical Specifications NinjaTek · 2026-08 · tds
  4. Filaflex 82A product page (Shore hardness and elongation) Recreus · 2026-08 · vendor
  5. Ultrafuse TPU 85A Technical Data Sheet (Version 3.0) BASF Forward AM · 2022-08 · tds
  6. PolyLite PLA Technical Data Sheet V5.4 Polymaker · 2024-11 · tds
  7. PLA Basic — product page Bambu Lab US Store · 2026-08 · vendor
  8. MH Build Series PLA Filament White 1.75mm 1kg MatterHackers · 2026-08 · vendor
  9. 3DJAKE ecoPLA Black 1.75mm 1000g 3DJake International · 2026-08 · vendor
  10. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  11. Siraya Tech Flex TPU 85A Filament — product page Siraya Tech · 2026-08 · vendor
  12. JAYO PLA Classic 1.1KG 1.75mm JAYO Official Store · 2026-08 · vendor
  13. ELEGOO PLA Filament 1.75mm Colored 1KG Elegoo US Official Store · 2026-08 · vendor
  14. Fillamentum PLA Extrafill Natural 1kg Fillamentum USA · 2026-08 · vendor
  15. Prusament PLA Jet Black 1kg (NFC) Prusa Research · 2026-08 · vendor
  16. Proto-pasta product catalogue Proto-pasta · 2026-08 · vendor
  17. add:north TPU Pro Matte 85A product page add:north · 2026-08 · vendor
  18. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  19. PLA — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  20. Fiberlogy rPLA Refill Anthracite 850 g 3DJake International · 2026-08 · vendor
  21. JAYO Silk PLA+ 1.75mm 1.1kg JAYO Official Store · 2026-08 · vendor
  22. ColorFabb PLA/PHA 750g 3D Universe · 2026-08 · vendor
  23. Prusament PLA Technical Data Sheet v1.0 Prusa Polymers · 2018-09 · tds
  24. Prusament rPLA Corn Pigment 1kg — product page Prusa Research · 2026-08 · vendor
  25. PLA — material guide Prusa Knowledge Base · 2026-08 · doc
  26. Flexible (TPE/TPU) — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  27. TPU — material basics Polymaker Wiki · 2026-08 · doc
  28. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  29. Prusament PLA — material page Prusa Polymers · 2026-08 · doc
  30. PLA — material basics Polymaker Wiki · 2026-08 · doc
  31. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  32. Extrudr Product Catalogue (DURAPRO PA12 data block) Extrudr · 2025-03 · tds
  33. Filament Drying Recommendations Bambu Lab Wiki · 2026-08 · doc
  34. PolySonic PLA Technical Data Sheet V5.4 Polymaker · 2024-11 · tds
  35. 16 PLA brand comparison test — results spreadsheet My Tech Fun (Igor Gaspar) · 2022-10 · test
  36. Creality Hyper PLA filament review — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  37. NinjaTek technical specs comparison chart (Cheetah, NinjaFlex, Armadillo, Alloy 910, Nylon 645) NinjaTek · 2026-08 · tds
  38. Easy PLA — product and technical data Fiberlogy · 2026-08 · tds
  39. Carbon Fiber PLA vs META-PLA vs PLA+ vs PLA by Sunlu — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  40. BambuLab PLA Basic vs PLA Tough vs PLA-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  41. PolyTerra PLA vs PLA+ — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  42. BambuLab TPU 95A HF vs Qidi TPU 95A HF — results spreadsheet My Tech Fun (Igor Gaspar) · 2024-02 · test
  43. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  44. Bambu Filament Technical Data Sheet V3.0 — PLA Matte Bambu Lab · 2026-08 · tds
  45. Characterization of Thermal Expansion Coefficient of 3D Printing Polymeric Materials Using Fiber Bragg Grating Sensors Materials 17(18):4668 · 2024-09 · paper
  46. Filamentive PLA (recycled) — product page Filamentive · 2026-08 · vendor
  47. Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments (Azimi et al.) Environmental Science & Technology 50(3) 1260-1268 · 2016-01 · paper
  48. Solubility Study of Ingeo Biopolymer Grades in Common Organic Solvents (NWPD003) NatureWorks · 2019-10 · tds
  49. Elastollan — Chemical properties: swelling and chemical resistance BASF · 2026-08 · tds
  50. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  51. Effect of vapour smoothing in trichloromethane on 3D printed PLA — surface, mechanical and chemical structure Pitale, Keche & Chopra, Engineering Research Express 6(4) 045579 · 2024-12 · paper