3D Printing Info

Filament comparison

PA12-GF vs PETG

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

Glass-fibre PA12 (PA12-GF) guidePETG guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PA12-GF comparisonsMore PETG comparisons
PA12-GF vs PETG — documented properties and sources
PropertyGlass-fibre PA12 (PA12-GF)PAPETGPETG
Market snapshot
Listing priceUSD/kg; dated snapshots$130.67/kg median; $46.00–$140.18/kg across 3 dated product listings$19.99/kg median; $8.99–$69.99/kg across 21 dated product listings
Identity & Market
Base polymer / chemistryPA12 reinforced with chopped glass fibre — 3DXTech's grade is nominally 30 wt%[1]Polyethylene terephthalate glycol copolymer — PET with a glycol comonomer that suppresses crystallisation[2][3]
Densityg/cm³1.23 (ISO 1183)[1]1.24–1.30 (ISO 1183)[2][3][4][5]
Typical priceUSD/kg1 kg-equivalent spools span 46–140; the middle of the market is about 88[6][7][8]1 kg spools cluster near 20[9][10][11]
Price range across brandsUSD/kg46–140 across brands; IEMAI 3D 46, 3DXTech 131 at 750 g and 130 at 2 kg, PrimaCreator NylonPower Glass Fiber 140 at 500 g[6][7][8]12–70 across brands; IEMAI 12, ELEGOO 14, CHCKX 14, Bambu Lab 18–20, Hatchbox 26, Prusament 38, Prusament PETG V0 70[9][10][12][11][13][14]
Market availability1–5Available from several mainstream brands[6][7]Ubiquitous, every brand and retailer[9][10][15][11]
Spool sizes & diameters1.75 and 2.85 mm; 0.5, 0.75 and 2 kg spools[6][8]1.75 and 2.85 mm; 0.75, 0.8 and 1 kg spools plus spool-less refills[10][11]
Typical applicationsStiff, humidity-stable structural parts — the glass gives the modulus, the PA12 matrix limits the moisture drift[1][16]Functional parts, enclosures and outdoor fittings that need more toughness and heat tolerance than PLA[2][3]
Diameter tolerance± mmNot documented±0.02 (Prusament)[2]
Printing Parameters
Nozzle temperature°CNot documented230–260 across brands; Prusament 250 ± 10, Polymaker 240–260[2][3][5]
Bed temperature°CNot documented60–90; Prusament 80 ± 10, Polymaker 60–70[2][5]
Enclosure / chamber requirement1–5Enclosure required (passive)[17]Open frame is fine[5]
Part cooling fanNot documentedAround 50 %; Polymaker specifies 20–60 %, less than PLA to protect layer bonding[2][5]
Bed surface & adhesion aidPEI sheet with a glue stick, or a dedicated adhesive such as Magigoo[18][17]Textured PEI, satin or powder-coated sheets. On smooth PEI a glue stick is used as a release agent, not an adhesive — PETG bonds to bare PEI hard enough to tear the sheet[2][5]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented8–15 (PrusaSlicer guidance); My Tech Fun ran Bambu Lab PETG Basic at 13 mm³/s[19][20]
Warping tendency1–5Not documentedSlight — corner lift on large flat parts[2][5]
Bed-adhesion difficulty1–5Needs a specific surface plus adhesive[18]Needs the right surface or a thin adhesive — the problem is releasing the part, not sticking it[2]
Stringing / oozing tendency1–5Moderate — retraction tuning needed[17]Moderate — retraction tuning needed[2][5]
Overall printing difficulty1–5Advanced — enclosure, hardware upgrades, tuning[17]Easy — minor profile tuning[5]
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required — no nozzle-life figure is published for a PA12-GF30 grade; Polymaker measures about 9 h of brass nozzle life on its comparable fibre-filled nylons[21]Brass fine indefinitely[19]
Abrasiveness1–5Highly abrasive — standard GF composite[21]Non-abrasive[5]
Nozzle clog risk1–5High — jams from moisture, heat creep or particles[22]Low — no special hot-end required and clogging is not among the listed drawbacks; Prusa lists no drybox and no hardened nozzle[23][24]
Heat-creep / jam sensitivity1–5Moderate — good heatbreak cooling needed[18]Slightly sensitive[23]
Hotend requirementMay require an all-metal hot end (Simplify3D)[18]No special hot-end required[23]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5High (0.8–2 %) — the PA12 matrix takes up far less than PA6, on the evidence of Polymaker's 1.5 % for PA12-CF10 against 3.33 % for PA6-GF25[25][26]Moderate (0.3–0.8 %) — Bambu Lab reports 0.40 % saturated at 25 °C / 55 % RH; Prusa measures only 0.07 % in 24 h and 0.10 % in 7 days at the drier 22 % RH[2][27]
Equilibrium moisture content at ~50 % RH%Not documented0.10 after 7 days at 24 °C / 22 % RH (Prusa Polymers); 0.40 saturated at 25 °C / 55 % RH (Bambu Lab)[2][27]
Drying temperature & timeNot documented60–65 °C for 6–8 h[5][27]
Symptoms when wetNot documentedBubbling and popping at the nozzle, stringing and a rough surface[2]
Effect of moisture on strengthPolymaker's PA12 grades change little between wet and dry, unlike PA6; the CoPA dry-to-wet blocks show the PA6-type response[16][28]Polymaker groups PETG with nylon, PVA and TPU as highly hygroscopic and shows a before-and-after-drying comparison; the loss appears as poor layer adhesion and weak, brittle layers rather than a published dry-versus-conditioned figure[22]
Storage requirementSealed below 20 % RH with desiccant[22]Sealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[22][29]
Hydrolysis at melt temperaturePolymaker specifies an 80–100 °C dry and storage below 20 % RH; no molecular-weight loss figure is published, and the wet data it does publish is conditioning rather than melt hydrolysis[21][28]Not documented
Mechanical Properties
Tensile strength (XY)MPa82 at break (printed XY, ISO 527)[1]38–51 (printed XY, ISO 527); Prusament 47 ± 2 at yield; 62 on My Tech Fun 4×4 mm bars[2][3][4][30]
Young's modulusMPa7800 (printed XY, ISO 527)[1]1500–2311 (printed XY, ISO 527)[2][3][4][5]
Elongation at break%4.5 at break (printed XY, ISO 527) — nearly double the 2.4 % of Polymaker's PA6-GF25[1][26]5.2–9.3 at break (printed XY, ISO 527); Prusament 5.1 at yield[3][4][5][2]
Flexural strengthMPa94 (printed XY, ISO 178)[1]58–80 (printed XY, ISO 178); Prusament 66 ± 2[2][3][4][5]
Flexural modulusMPa7550 (printed XY, ISO 178)[1]1068–2277 (printed XY, ISO 178)[2][3][4][5]
Charpy impact, notchedkJ/m²Not documented2.6 (PolyLite) to 11.6 (PolyMax) printed XY, ISO 179, notched; Prusament 6 ± 1[3][4][2]
Other impact dataNot documentedCharpy unnotched does not break on Prusa's 4 J pendulum (ISO 179-1); Izod 3.37 kJ/m² on My Tech Fun printed bars[2][30]
Layer adhesion / Z tensileMPaNot documented18 ± 4 (Prusa interlayer adhesion test); 42.8 printed Z for PolyLite PETG; 33 on My Tech Fun bars[2][3][30]
Brittleness1–5Moderate[1]Moderate[2][3]
Hardness (scale-specific)Shore A / Shore D / RockwellRockwell M88 / R117 on extruded PA66-GF30 stock (ASTM D785); no figure is published for a glass-fibre PA12 filament[31]74 Shore D (Prusa Polymers method); measured on printed bars at 68.2 for Extrudr PETG, 72 for Fiberlogy PETG and 72.8 for Prusament PETG[2][30][32][33]
Creep resistance / sustained load1–5Good. Ensinger lists high creep resistance for extruded PA66-GF30 stock, and the PA12 matrix absorbs far less water than PA6, so a PA12-GF part holds load better in a humid environment[31][17]Below average — a 12 mm bar sagged to 18.2 mm (Fiberlogy) and 19.4 mm (Bambu Lab Basic) over 5 days at 1.25 kg[30][20]
Fatigue / repeated-flex resistance1–5Good. Ensinger lists high fatigue strength as a headline property of extruded PA66-GF30 stock[31]Moderate — 79 000–193 000 cycles at 30 % of tensile strength, about three times printed PLA (R = 0.2, 7 Hz)[34]
Elasticity / flexibility1–5Rigid[1]Slightly flexible in thin sections[2]
Z strength as % of XY%Not documented84 (PolyLite, printed Z against XY tensile)[3]
Thermal Properties
HDT at 0.45 MPa°CNot documented68 (Prusament) to 78 (PolyLite), ISO 75 at 0.45 MPa[2][3][5]
HDT at 1.8 MPa°CNot documented65 (Polymaker) to 75 (PolyLite), ISO 75 at 1.8 MPa; Prusament 68[2][3][5]
Glass transition (Tg)°CNot documented71–81 (DSC)[3][4][5]
Melting point / Vicat°CNot documentedAmorphous — no melting point; Vicat 75–84 (ISO 306)[3][4][5]
Continuous service temperature°CNot documented61–66 — loaded bars begin to move at this temperature across six grades from four brands; Prusa publishes 68 for Prusament PETG[30][32][33][20][35]
Thermal expansion (CTE)µm/m·K48.6 on extruded PA66-GF30 stock (ASTM D696; source states 2.7e-5 in/in/°F) — no figure is published for a glass-fibre PA12 filament[31]65 at 30 °C (neat PETG, large-format printed bead, TMA)[36]
Flammability / UL 94Flammable; no UL 94 rating published for the grades surveyed[21]Flammable; no UL 94 rating published for standard PETG, though flame-retardant V0 grades exist[37][29]
Environment & Chemical
UV resistance1–5Months outdoors before embrittlement — unstabilised polyamide yellows under UV[17]Moderate — a season or two[2]
Chemical resistanceWithstands oils, fuels and alkalis[17]Withstands acids, alkalis, oils and UV exposure — Polymaker names outdoor use as a result[29]
Water / humidity resistance in service1–5Good — minor absorption relative to PA6-based composites[16]Good — minor absorption[2]
Food contactNot food-contact certified as filament[17]PET is the polymer of drinks bottles, but printed layer grooves harbour bacteria and no filament here carries a food-contact certification[29]
Biodegradability / compostabilityNot biodegradable[17]Not biodegradable[29]
RecyclabilityNot accepted in household plastic collection[17]PET is widely recycled as bottle stock, but printed PETG waste is not accepted in household collection[29]
Electrical & ESD propertiesSurface resistance above 10¹³ ohm/sq — insulating (ASTM D257)[1]Not documented
Health & Safety
Fume toxicity1–5Moderate — measurable VOCs and UFPs, ventilation advised[38]Moderate — measurable VOCs and UFPs, ventilation advised[38]
VOC emission rateµg/minUp to 180 caprolactam, the dominant VOC from nylon and the largest single-VOC rate in the study[38]Not documented
Ultrafine-particle emission rateparticles/min≈2 × 10⁸ median for nylon — low for particles despite the highest VOC mass measured[38]≈5 × 10⁹ median for the PET-based T-Glase filament in the same chamber study, against ≈1 × 10⁸ for PLA[38]
Hazardous species emittedCaprolactam, at up to 180 µg/min from nylon filament[38]Not documented
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[38]Open a window / occasional ventilation[38]
Dust & fibre handling hazardGlass fibre is bound in the matrix; avoid inhaling sanding dust[1]Not documented
Post-Processing
Sanding & machiningSands poorly — gums rather than powders[18]Sands poorly — the material is tough and gums rather than powders[23]
Painting & finishingNot documentedPaint adheres poorly without abrasion and a primer[2]
Gluing & solvent weldingCyanoacrylate; no common solvent welds polyamide[18]Cyanoacrylate; no common solvent welds PETG cleanly[23]
Vapour / chemical smoothingNo practical vapour smoothing[18]No practical vapour smoothing[2]
Support material pairingNot documentedPrints its own supports; Polymaker rates PolyDissolve S1 for PETG[23]
Dimensional accuracy & detailNot documentedStringing and blobbing are the usual accuracy limits, not shrinkage[2][5]
Solvents & Solubility
Soluble inFormic acid, phenol, m-cresol and hexafluoroisopropanol dissolve the matrix at 23 °C, leaving the fibre; laboratory reagents.[39]No common workshop solvent; 1,2-dichloroethane destroys it inside a week and dichloromethane — a carcinogen — dissolves the surface.[40][41]
Softened or crazed byZinc chloride solutions stress-crack the nylon matrix, alcoholic calcium chloride dissolves it, mineral acids attack it.[39]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[40]
Solvent welding & smoothing agentNone — nylon's only solvents (formic acid, phenol, HFIP) degrade the part, and the fibre blocks surface flow anyway.[39]Dichloromethane brushed on is the only agent that smooths PETG — a controlled carcinogen, not workshop stock.[41]

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. FibreX PA12-GF30 Technical Data Sheet v1.0 3DXTech · 2026-08 · tds
  2. Prusament PETG Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  3. PolyLite PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  4. PolyMax PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  5. Polymaker PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  6. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  7. IEMAI 3D GF-PA12 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  8. PrimaCreator SELECT NylonPower Glass Fiber product page PrimaCreator · 2026-08 · vendor
  9. PETG Basic — product page Bambu Lab US Store · 2026-08 · vendor
  10. Polymaker product catalogue Polymaker · 2026-08 · vendor
  11. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  12. Black PETG Filament 1.75 mm 1 kg — product data Hatchbox · 2026-08 · vendor
  13. IEMAI PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  14. CHCKX PETG 3D Printer Filament 1.75 mm 1 kg, Black CHCKX (Amazon US) · 2026-08 · vendor
  15. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  16. Moisture Conditioning — effect on printed nylon properties Polymaker Wiki · 2026-08 · doc
  17. PA (Nylon) — material basics Polymaker Wiki · 2026-08 · doc
  18. Nylon — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  19. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  20. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  21. Fiberon PA6-CF20 Technical Data Sheet V1.1 Polymaker · 2024-12 · tds
  22. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  23. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  24. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  25. Fiberon PA12-CF10 Technical Data Sheet V1.1 Polymaker · 2025-02 · tds
  26. Fiberon PA6-GF25 Technical Data Sheet V1.1 Polymaker · 2024-12 · tds
  27. Bambu Filament Technical Data Sheet — PETG HF Bambu Lab · 2026-08 · tds
  28. PolyMide CoPA Technical Data Sheet V5.4 (dry and wet status blocks) Polymaker · 2024-11 · tds
  29. PETG — material basics Polymaker Wiki · 2026-08 · doc
  30. PCTG vs PETG comparison — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  31. TECAMID 66 GF30 black (PA66-GF30) — stock shape properties Ensinger · 2026-08 · tds
  32. Extrudr PETG vs PCTG vs XPETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  33. Prusament PETG-CF vs PETG V0 vs PETG — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  34. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  35. Prusament PETG — material page Prusa Polymers · 2026-08 · doc
  36. Effects of Fiber Orientation on the Coefficient of Thermal Expansion of Fiber-Filled Polymer Systems in Large Format Polymer Extrusion-Based Additive Manufacturing Materials 15(8):2764 · 2022-04 · paper
  37. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  38. 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
  39. Ultramid Nylon Chemical Resistance guide (unmodified PA6 B27E and PA66 A27E) BASF · 2026-08 · tds
  40. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  41. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc