3D Printing Info

Filament comparison

PLA vs PLA-GF

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

PLA (standard) guideGlass-fibre PLA (PLA-GF) guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PLA comparisonsMore PLA-GF comparisons
PLA vs PLA-GF — documented properties and sources
PropertyPLA (standard)PLAGlass-fibre PLA (PLA-GF)PLA
Market snapshot
Listing priceUSD/kg; dated snapshots$19.74/kg median; $9.99–$32.99/kg across 24 dated product listings$44.99/kg median; $29.99–$59.99/kg across 2 dated product listings
Identity & Market
Base polymer / chemistryPoly(lactic acid), a thermoplastic aliphatic polyester from fermented plant starch[1][2]PLA filled with chopped glass fibre — 12 wt% (Polymaker HT-PLA-GF), 15–20 wt% (eSUN PLA-GF). Bambu Lab PLA Galaxy uses glass microspheres, not fibre, and is not equivalent[3][4][5]
Densityg/cm³1.17–1.24 (ISO 1183)[1][6][2]1.31 (eSUN) to 1.337 (Polymaker), ISO 1183 / GB/T 1033[3][4]
Typical priceUSD/kgMainstream 1 kg spools cluster near 20[7][8][9]1 kg spools cluster near 30[10][11]
Price range across brandsUSD/kg10–33 across brands; budget house brands 10–14, premium European 26–33[12][13][14][15]30–60 across brands; Polymaker 30, Proto-pasta 60[10][11]
Market availability1–5Ubiquitous, every brand and retailer[16][17]Niche, a handful of specialist brands[10][11][4]
Spool sizes & diameters1.75 and 2.85 mm; 0.75, 0.85, 1 and 1.1 kg spools plus spool-less refills[7][18][19][14][20]1.75 mm; 0.5 and 1 kg spools[11][21]
Typical applicationsConcept models, functional prototypes, low-wear toys, jigs used at room temperature[22]Stiff brackets and fixtures; the Polymaker grade is aimed at parts annealed for heat resistance[3]
Diameter tolerance± mm±0.02 (Prusament) to ±0.03 (Bambu Lab, Prusa Research standard)[1][7][23]Not documented
Printing Parameters
Nozzle temperature°C190–230; Prusament specifies 210 ± 10[1][6][2]210–230 (Polymaker HT-PLA-GF)[3]
Bed temperature°C25–60; Prusament 40–60, Bambu Lab 35–45[1][6][2]25–60 (Polymaker HT-PLA-GF)[3]
Enclosure / chamber requirement1–5Open frame is fine[6][16]Open frame is fine[3]
Part cooling fan100 % from the second layer; reduce on the first one or two layers for bed adhesion[1][17]Fan on — eSUN specifies 100 %[4]
Bed surface & adhesion aidSmooth or textured PEI, glass or painter's tape; glue stick only where release is a problem[6][24][17]Not documented
Maximum volumetric flow (mm³/s; see test conditions)mm³/s12–20 (PrusaSlicer max volumetric speed guidance for PLA)[25]28 at Polymaker's stated 350 mm/s on a 0.4 mm nozzle at 0.2 mm layer; eSUN prints its specimens at 60 mm/s[3][4][25]
Warping tendency1–5None[26][16]Not documented
Bed-adhesion difficulty1–5Sticks to anything — glue only needed on smooth PEI[6][2][17]Not documented
Stringing / oozing tendency1–5Slight — 1–3 mm retraction handles it; oozing rises with nozzle temperature[6][17][27]Not documented
Shrinkage%Not documented0.05 in X-Y and Z, 0.10 diagonal (Polymaker HT-PLA-GF)[3]
Overall printing difficulty1–5Beginner — prints on any machine out of the box[16][17]Intermediate — dry filament and a tuned profile; hardened nozzle mandatory[3]
Extruder requirementAny extruder; Bowden and direct drive both fine, no hardware upgrades[16]Not documented
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely[16]Hardened steel required[3]
Abrasiveness1–5Non-abrasive[26][16]Highly abrasive — standard GF composite[3]
Nozzle clog risk1–5Very low[16][17]Moderate — needs dry filament and a clean nozzle; Prusa lists higher risk of nozzle clogging for glass-filled composites[28]
Heat-creep / jam sensitivity1–5Moderate — good heatbreak cooling needed; softens below 60 °C so it deforms in a warm cold zone[24][29]Not documented
Hotend requirementAny standard hotend; PTFE-lined is fine at PLA temperatures[16]Hardened steel or ruby nozzle; Polymaker's own slicer preset sets a minimum nozzle hardness of 40 HRC[3]
Other hardware wearNone — brass nozzles and standard drive gears are unaffected[26][16]Not documented
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Moderate — 0.40–0.51 % saturated at 23–25 °C and 55–70 % RH[2][6][30]Moderate — the PLA matrix takes up 0.40–0.51 % saturated; no glass-filled grade publishes its own figure[2][6]
Equilibrium moisture content at ~50 % RH%0.43 saturated at 25 °C / 55 % RH (Bambu Lab); 0.51 equilibrium (Polymaker)[2][6]Not documented
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][29]60 °C for 6 h (Polymaker HT-PLA-GF)[3]
Symptoms when wetBubbling and popping at the nozzle, stringing, rough surface and weak layers[31]Not documented
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 rates PLA low-sensitivity and publishes no dry-versus-conditioned figures for this grade; absorbed water flashes to steam and shows as bubbling and poor layer adhesion[31]
Storage requirementSealed with desiccant below 20 % RH; shelf life at ambient is long[2][17]Not documented
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][32][33]50.1 as printed and 50.2 annealed, printed XY, ISO 527 (Polymaker); eSUN quotes 59.3 by GB/T 1040[3][4]
Young's modulusMPa2300–3427 (printed XY, ISO 527)[1][6][2]3794 as printed, 4207 annealed, printed XY, ISO 527 (Polymaker)[3]
Elongation at break%6.3–12.2 (printed XY, ISO 527); Prusament quotes 2.9 at yield[6][2][1]2.77 as printed, 2.3 annealed, printed XY, ISO 527 (Polymaker); eSUN quotes 7.99[3][4]
Flexural strengthMPa76–87 (printed XY, ISO 178); Fiberlogy quotes 81 by ASTM D790[1][6][2][34]86.4 printed XY, ISO 178 (Polymaker)[3]
Flexural modulusMPa2750–3230 (printed XY, ISO 178); Fiberlogy quotes 3800 by ASTM D790[1][6][2][34]3685 printed XY, ISO 178 (Polymaker); eSUN quotes 4415 flexural modulus by GB/T 9341[3][4]
Charpy impact, notchedkJ/m²3.3–7.9 (printed XY, ISO 179, notched)[6][2]5.31 ± 0.46 as printed and 4.92 ± 0.50 annealed (printed XY, ISO 179, notched); Z 4.28 ± 0.18[3]
Other impact dataCharpy unnotched, printed: 13–14 (Prusament, ISO 179-1), 26.6 (Bambu Lab PLA Basic)[1][2]Izod 10.16 kJ/m² (eSUN, GB/T 1843)[4]
Layer adhesion / Z tensileMPa17–31 (Prusa interlayer test and printed Z tensile); 23 mean on My Tech Fun 4×4 mm bars[1][2][33]23.7 as printed, 22.5 annealed, printed Z, ISO 527 (Polymaker)[3]
Brittleness1–5Brittle — snaps with little warning[24][26]Very brittle — elongation at break 2.77 % in XY and 0.85 % in Z[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][35]Not documented
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[36][37]Poor — no GF-grade creep test; plain printed PLA sagged from 12 to 16.2–21.8 mm over 5 days at 1.25 kg[36][38][35]
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)[39][24]Poor — no grade-specific S-N curve; plain printed PLA ran 38 000–49 000 cycles at 30 % of tensile strength and elongation at break falls to 2.77 % in XY and 0.85 % in Z[39][3]
Elasticity / flexibility1–5Rigid[26]Rigid[3]
Z strength as % of XY%77–89 on TDS specimens; ≈44 on My Tech Fun 4×4 mm bars[6][2][33]47 as printed (23.7 Z against 50.1 XY), printed[3]
Wear resistance & frictionNot documentedeSUN describes high wear resistance and positions the grade for wear parts[4]
Thermal Properties
HDT at 0.45 MPa°C55–60 (ISO 75, 0.45 MPa)[1][6][2]75.5 as printed, 114.7 after annealing (ISO 75, 0.45 MPa) — the point of the material[3]
HDT at 1.8 MPa°C54–58 (ISO 75, 1.8 MPa)[1][6][2]59.7 as printed, 84 after annealing (ISO 75, 1.8 MPa)[3]
Glass transition (Tg)°C55–61 (DSC)[1][6][2]59.8 (DSC)[3]
Melting point / Vicat°C145–160 peak melt (Prusament, ISO 11357); 150 and 160 by DSC (PolyLite, Bambu Lab); Vicat 57–63 (ISO 306)[22][6][2]174.9 peak melt (DSC); Vicat 148.9 as printed, 148.3 annealed[3]
Continuous service temperature°C50–55 — loaded bars begin to move at this temperature[26][33]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][40]Annealing lifts HDT at 0.45 MPa from 75.5 to 114.7 °C and modulus from 3794 to 4207 MPa[3]
Thermal expansion (CTE)µm/m·K96 ± 5 at 0° and 99 ± 5 at 90° raster (printed PLA, fibre Bragg grating, 25–50 °C)[41]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[24][22]Degrades within weeks outdoors[24]
Outdoor durabilityNot suitable for long-term outdoor use — UV embrittlement plus softening above 55 °C in direct sun[22][24]Not documented
Chemical resistanceGood against weak acids, oils and grease; poor against strong acids and alkalis; dissolved by chloroform, THF and hot benzene[6][24]Not documented
Water / humidity resistance in service1–5Good — insoluble in water, absorbs 0.4–0.5 % at equilibrium[2][42]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[24][42]Not documented
Biodegradability / compostabilityIndustrially compostable only — needs sustained 55 °C and specific microbial conditions; not home compostable[42][24][2]Not documented
RecyclabilityMechanically recyclable; not accepted in household plastic collection, so brand take-back schemes are the practical route[42]Not documented
Health & Safety
Fume toxicity1–5Low hazard — minimal VOC and particle emission[43]Low hazard — minimal VOC and particle emission[43]
VOC emission rateµg/min4–5 lactide, the dominant VOC (chamber study, three printers)[43]Not documented
Ultrafine-particle emission rateparticles/min≈1 × 10⁸ median across three printers; only laywood ≈8 × 10⁷ and laybrick ≈6 × 10⁷ were lower[43]Not documented
Hazardous species emittedLactide (3,6-dimethyl-1,4-dioxane-2,5-dione) dominates; no styrene or caprolactam as a leading species[43]Not documented
Ventilation / filtration requirement1–5None needed in a normal room[43]None needed in a normal room[43]
Dust & fibre handling hazardNot documentedGlass fibre is bound in the matrix; avoid inhaling sanding dust[44]
Post-Processing
Sanding & machiningWet sanding — dry sanding heats the surface by friction and smears it[22][24]Not documented
Gluing & solvent weldingCyanoacrylate for most joints; some grades partially dissolve and bond with acetone, depending on additives and colour[24][23]Not documented
Vapour / chemical smoothingNo practical vapour smoothing — only chloroform, hot benzene or THF, which are laboratory-only[24]Not documented
Support material pairingPolySupport and PolyDissolve S1 (Polymaker); Support for PLA (Bambu Lab)[6][2]Not documented
Dimensional accuracy & detailGood — low shrinkage and features under 0.2 mm resolve; 55° overhangs and 30 mm bridges[26][2][17]Near-zero shrinkage — 0.05 % in X-Y and Z (Polymaker)[3]
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.[45]Chloroform dissolves the PLA matrix (10 % w/v, 2–4 h at 23 °C) and leaves the filler as loose sludge; laboratory reagent.[45]
Softened or crazed byAcetone, ethyl acetate and toluene plasticise it but dissolve <1 % even at 65 °C; submersion in acetone crazes and destroys parts.[45][46]Acetone, ethyl acetate and toluene plasticise the matrix but dissolve <1 % even at 65 °C; acetone submersion crazes parts.[45][46]
Solvent welding & smoothing agentChloroform vapour smooths and welds PLA at the cost of tensile strength; acetone does not smooth it at all.[47][46]Chloroform vapour attacks only the resin fraction, so the filler is left standing proud; no workshop-safe agent exists.[47][46]

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. Polymaker HT-PLA-GF Technical Data Sheet V1.1 Polymaker · 2026-08 · tds
  4. eSUN ePLA-GF Technical Data Sheet V1.0 (Nov 2023) eSUN (copy hosted on 3d.nice-cdn.com) · 2023-11 · tds
  5. Bambu Filament Technical Data Sheet V1.0 — PLA Galaxy Bambu Lab · 2026-08 · 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. Polymaker HT-PLA-GF — product page Polymaker Shop · 2026-08 · vendor
  11. Proto-pasta product catalogue Proto-pasta · 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. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  17. PLA — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  18. Fiberlogy rPLA Refill Anthracite 850 g 3DJake International · 2026-08 · vendor
  19. JAYO Silk PLA+ 1.75mm 1.1kg JAYO Official Store · 2026-08 · vendor
  20. ColorFabb PLA/PHA 750g 3D Universe · 2026-08 · vendor
  21. Polymaker product catalogue Polymaker · 2026-08 · vendor
  22. Prusament PLA Technical Data Sheet v1.0 Prusa Polymers · 2018-09 · tds
  23. Prusament rPLA Corn Pigment 1kg — product page Prusa Research · 2026-08 · vendor
  24. PLA — material guide Prusa Knowledge Base · 2026-08 · doc
  25. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  26. Prusament PLA — material page Prusa Polymers · 2026-08 · doc
  27. PLA — material basics Polymaker Wiki · 2026-08 · doc
  28. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  29. Filament Drying Recommendations Bambu Lab Wiki · 2026-08 · doc
  30. PolySonic PLA Technical Data Sheet V5.4 Polymaker · 2024-11 · tds
  31. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  32. 16 PLA brand comparison test — results spreadsheet My Tech Fun (Igor Gaspar) · 2022-10 · test
  33. Creality Hyper PLA filament review — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  34. Easy PLA — product and technical data Fiberlogy · 2026-08 · tds
  35. Carbon Fiber PLA vs META-PLA vs PLA+ vs PLA by Sunlu — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  36. BambuLab PLA Basic vs PLA Tough vs PLA-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  37. PolyTerra PLA vs PLA+ — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  38. Polymaker PLA Pro vs PLA-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  39. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  40. Bambu Filament Technical Data Sheet V3.0 — PLA Matte Bambu Lab · 2026-08 · tds
  41. Characterization of Thermal Expansion Coefficient of 3D Printing Polymeric Materials Using Fiber Bragg Grating Sensors Materials 17(18):4668 · 2024-09 · paper
  42. Filamentive PLA (recycled) — product page Filamentive · 2026-08 · vendor
  43. 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
  44. StoneFil safety data sheet Formfutura · 2026-08 · msds
  45. Solubility Study of Ingeo Biopolymer Grades in Common Organic Solvents (NWPD003) NatureWorks · 2019-10 · tds
  46. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  47. 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