3D Printing Info

Filament comparison

PA6-GF vs PSU

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

Glass-fibre PA6 (PA6-GF) guidePSU guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PA6-GF comparisonsMore PSU comparisons
PA6-GF vs PSU — documented properties and sources
PropertyGlass-fibre PA6 (PA6-GF)PAPSUHIGHTEMP
Market snapshot
Listing priceUSD/kg; dated snapshots$59.98/kg median; $39.99–$130.00/kg across 6 dated product listings$168.00/kg median; $168.00–$168.00/kg across 1 dated product listings
Identity & Market
Base polymer / chemistryPA6 reinforced with chopped glass fibre — Polymaker's grade is 25 wt%[1][2]Polysulfone — the lowest-temperature and cheapest of the sulfone family[3]
Densityg/cm³1.14 (Bambu Lab) and 1.20 (Polymaker Fiberon), ISO 1183[2][1]1.24 (ISO 1183)[3]
Typical priceUSD/kg1 kg-equivalent spools span 40–130; the middle of the market is about 60[2][4][5]1 kg-equivalent spools cluster near 250[6]
Price range across brandsUSD/kg40–130 across brands; SUNLU 40, YXPOLYER 45, Polymaker Fiberon and Bambu Lab 60, 3DXTech FibreX 87, Obsidian Nylon 6+GF 130[4][2][6][5][7]168-250 across formats; 250 g spool $42 (168/kg), 500 g $125 (250/kg) — 3DXTech is the only filament supplier found[6]
Market availability1–5Stocked by most mainstream brands[2][4][6][5][7]Special order, 1–2 makers worldwide[6]
Spool sizes & diameters1.75 and 2.85 mm; 0.5, 0.75 and 1 kg spools[4][6][2]1.75 mm; 250 g and 500 g spools[6]
Typical applicationsStiff, heat-resistant structural parts where a matte finish and lower cost beat carbon fibre[2][1]Transparent high-temperature housings, medical trays and hot-water fittings[3]
Printing Parameters
Nozzle temperature°C260–290 (Bambu Lab)[2]Not documented
Bed temperature°CNot documented120–140 (3DXTech)[3]
Enclosure / chamber requirement1–5Enclosure required (passive) — Bambu Lab specifies a 45–60 °C chamber[2]Actively heated chamber required[8][9]
Recommended chamber temperature°C45–60 (Bambu Lab)[2]Not documented
Bed surface & adhesion aidPEI sheet with a glue stick, or a dedicated adhesive such as Magigoo[10][11]Not documented
Maximum volumetric flow (mm³/s; see test conditions)mm³/s10 at Bambu Lab's 130 mm/s cap on a 0.4 mm nozzle at 0.2 mm layer[2][12]Not documented
Bed-adhesion difficulty1–5Needs a specific surface plus adhesive[10]Not documented
Stringing / oozing tendency1–5Moderate — retraction tuning needed[11]Not documented
Overall printing difficulty1–5Expert / industrial hardware only[2][13]Expert / industrial hardware only[8][9]
Extruder requirement0.6 mm nozzle recommended by Bambu Lab; 0.4 and 0.8 also supported[2]Not documented
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required — Polymaker measures brass nozzle life at about 9 h on PA6-GF25 and recommends hardened steel or ruby[1]Brass fine indefinitely for unfilled grades, but brass softens near these nozzle temperatures — hardened or plated hot ends are the norm[8]
Abrasiveness1–5Highly abrasive — standard GF composite; Polymaker puts brass nozzle life at roughly 9 h on PA6-GF25[1]Non-abrasive when unfilled[3]
Nozzle clog risk1–5Very high — frequent jams without careful setup[13]Moderate — needs dry filament and a clean nozzle; 3DXTech lists no special nozzle concerns but a mandatory 120 °C pre-dry before every print[14]
Heat-creep / jam sensitivity1–5Moderate — good heatbreak cooling needed[10]Not documented
Hotend requirementMay require an all-metal hot end (Simplify3D)[10]Not documented
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Very high (>2 %) — 2.56 % saturated at 25 °C / 55 % RH (Bambu Lab) and 3.33 % equilibrium (Polymaker Fiberon), the highest in the dataset[2][1]Not documented
Equilibrium moisture content at ~50 % RH%2.56 saturated at 25 °C / 55 % RH (Bambu Lab); 3.33 equilibrium (Polymaker Fiberon PA6-GF25)[2][1]0.30 in 24 h on extruded stock (ASTM D570)[15]
Drying temperature & time80 °C for 8–12 h (Bambu Lab)[2]Not documented
Symptoms when wetPopping and cracking during extrusion, then hard-to-diagnose defects[16]Not documented
Effect of moisture on strengthPolymaker publishes dry and wet printed blocks for PA6-GF25 itself: at 4.57 % moisture tensile falls 80.1 → 40.2 MPa and modulus 5357 → 1794 MPa, while notched Charpy rises 10.0 → 28.0 kJ/m²[1][16]No dry-versus-conditioned figures are published; 3DXTech mandates a 120 °C, 4 h pre-dry before every print because trapped water flashes to steam at these nozzle temperatures[14]
Storage requirementSealed below 20 % RH with desiccant[13]Not documented
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[17][18]Not documented
Mechanical Properties
Tensile strength (XY)MPa75 ± 6 (Bambu Lab) and 80.1 ± 1.8 (Polymaker Fiberon, dry/annealed) printed XY, ISO 527; Fiberon falls to 40.2 ± 2.1 conditioned to 4.57 % moisture. Stratasys FDM PA6/66-GF30-FR gives 60.2-61.1 at break and 61.7-62.3 at yield printed XZ (ASTM D638)[2][1][19]52 (printed XY, ISO 527, 3DXTech); 81 at break on extruded stock (ASTM D638)[3][15]
Young's modulusMPa2850 ± 260 (Bambu Lab) and 5357 ± 211 (Polymaker Fiberon, dry) printed XY, ISO 527; Fiberon falls to 1794 ± 84 conditioned. Stratasys FDM PA6/66-GF30-FR gives 5600-5830 printed XZ against 3050-3140 in ZX (ASTM D638)[2][1][19]2100 (printed XY, ISO 527)[3]
Elongation at break%2.4 ± 0.2 dry (Polymaker Fiberon) to 3.9 ± 0.8 (Bambu Lab) printed XY, ISO 527; the Fiberon grade rises to 4.2 ± 0.7 conditioned[2][1]8 (printed XY, ISO 527) against 50 on extruded stock — nearly three times PPSU's printed 3 %[3][20][15]
Flexural strengthMPaNot documented87 (printed XY, ISO 178)[3]
Flexural modulusMPa3670 ± 140 printed XY, ISO 178 (Bambu Lab)[2]2050 (printed XY, ISO 178)[3]
Charpy impact, notchedkJ/m²10.0 ± 0.7 printed XY dry and 28.0 ± 1.0 conditioned, ISO 179 notched (Polymaker Fiberon); Bambu Lab 7.2 ± 2.3[1][2]Not documented
Other impact dataCharpy unnotched 27.2 ± 2.2 printed XY (Bambu Lab, ISO 179). Stratasys FDM PA6/66-GF30-FR gives Izod notched 74.6-77.1 J/m printed XZ against 17.2-22.1 in ZX (ASTM D256)[2][19]Izod notched 69 J/m on extruded PSU stock, converted from 1.3 ft-lb/in (ASTM D256)[15]
Layer adhesion / Z tensileMPa27 ± 5 (Bambu Lab) and 60.7 ± 1.1 (Polymaker Fiberon, dry) printed Z, ISO 527 — the two makers differ by more than a factor of two; Fiberon falls to 26.3 ± 1.5 conditioned. Stratasys FDM PA6/66-GF30-FR gives 23.7-24.4 at break printed ZX (ASTM D638)[2][1][19]Not documented
Brittleness1–5Brittle — snaps with little warning; elongation at break 2.4 % in XY[1]Moderate[3]
Hardness (scale-specific)Shore A / Shore D / RockwellRockwell M88 / R117 on extruded PA66-GF30 stock (ASTM D785)[21]Rockwell M120 on extruded PSU stock (ASTM D785)[15]
Creep resistance / sustained load1–5Good. Ensinger lists high creep resistance as a headline property of extruded PA66-GF30 stock; the rating is held below Excellent because equilibrium moisture uptake of 3.33 % softens the matrix in service[21][1]Good. Ensinger lists high creep resistance as a headline property of extruded PSU stock, which is rated to 173 °C heat deflection at 1.8 MPa[15]
Fatigue / repeated-flex resistance1–5Good. Ensinger lists high fatigue strength as a headline property of extruded PA66-GF30 stock[21]Not documented
Elasticity / flexibility1–5Rigid[2]Rigid[3]
Z strength as % of XY%36 (Bambu Lab) to 76 (Polymaker Fiberon), printed; Stratasys FDM PA6/66-GF30-FR gives 39-41 (ZX against XZ tensile at break, ASTM D638)[2][1][19]Not documented
Thermal Properties
HDT at 0.45 MPa°C182 (Bambu Lab) and 191 (Polymaker Fiberon), ISO 75 at 0.45 MPa. Stratasys FDM PA6/66-GF30-FR gives 161 printed XY and 185 XZ (ASTM D648 at 66 psi)[2][1][19]172 (printed XY, ISO 75 at 0.45 MPa, 3DXTech); 181 on extruded stock, converted from 358 °F at 66 psi[3][15]
HDT at 1.8 MPa°C157 (Polymaker Fiberon) and 158 (Bambu Lab), ISO 75 at 1.8 MPa[2][1]174 on extruded PSU stock, converted from 345 °F at 264 psi (ASTM D648)[15]
Glass transition (Tg)°C67 (Bambu Lab) and 70.4 (Polymaker Fiberon), DSC; Stratasys measures 51.5 on FDM PA6/66-GF30-FR (ASTM D7426)[2][1][19]187 (DSC, 3DXTech) and 185 on extruded stock (ASTM D3418), against 230 for PPSU[3][20][15]
Melting point / Vicat°C214.5 (Polymaker Fiberon) and 219 (Bambu Lab) melting, DSC; Vicat 210–212 (ISO 306)[2][1]Not documented
Continuous service temperature°CNot documented141 long-term service on extruded PSU stock, converted from 285 °F[15]
Thermal expansion (CTE)µm/m·K48.6 on extruded PA66-GF30 stock (ASTM D696; source states 2.7e-5 in/in/°F). Stratasys measures much higher on printed FDM PA6/66-GF30-FR — 95.4 over -20 to 5 °C and 214 over 25 to 80 °C in XY (ASTM E831)[21][19]55.8 (extruded PSU stock, ASTM D696; source states 3.1e-5 in/in/°F)[15]
Flammability / UL 94Flammable; no UL 94 rating published for the grades surveyed[17]UL 94 V-0 on extruded PSU stock[15]
Environment & Chemical
UV resistance1–5Months outdoors before embrittlement — unstabilised polyamide yellows under UV[11]Not documented
Chemical resistanceWithstands oils, fuels and alkalis[11]Not documented
Water / humidity resistance in service1–5Absorbs water, properties shift[16]Not documented
Food contactNot food-contact certified as filament[11]Not documented
Biodegradability / compostabilityNot biodegradable[11]Not documented
RecyclabilityNot accepted in household plastic collection[11]Not documented
Electrical & ESD propertiesSurface resistivity above 10¹² ohm — insulating (Polymaker Fiberon, ANSI/ESD S11.11)[1]Surface resistance above 10¹³ ohm/sq — an insulator (IEC 60093)[3]
Health & Safety
Fume toxicity1–5Moderate — measurable VOCs and UFPs, ventilation advised[22]Moderate — measurable VOCs and UFPs, ventilation advised. None of these polymers was in the chamber study, and all are processed far above the temperatures it covered[22]
VOC emission rateµg/minUp to 180 caprolactam, the dominant VOC from nylon and the largest single-VOC rate in the study[22]Not documented
Ultrafine-particle emission rateparticles/min≈2 × 10⁸ median for nylon — low for particles despite the highest VOC mass measured[22]Not documented
Hazardous species emittedCaprolactam, at up to 180 µg/min from nylon filament[22]Not documented
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[22]Ventilated room or enclosure recommended[22]
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[10]Not documented
Gluing & solvent weldingCyanoacrylate; no common solvent welds polyamide[10]Not documented
Vapour / chemical smoothingNo practical vapour smoothing[10]Not documented
Solvents & Solubility
Soluble inFormic acid, phenol, m-cresol and hexafluoroisopropanol dissolve the matrix at 23 °C, leaving the fibre; laboratory reagents.[23]Chlorinated hydrocarbons — dichloromethane, chloroform — dissolve polysulfone; ketones and esters attack it as well.[24][25]
Softened or crazed byZinc chloride solutions stress-crack the nylon matrix, alcoholic calcium chloride dissolves it, mineral acids attack it.[23]Acetone, MEK, ethyl acetate, benzene and toluene craze or stress-crack it; methanol and isopropanol only marginally.[25][24]
Solvent welding & smoothing agentNone — nylon's only solvents (formic acid, phenol, HFIP) degrade the part, and the fibre blocks surface flow anyway.[23]Dichloromethane cement welds PSU and NMP softens residual resin. Both are laboratory reagents.[24]

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. Fiberon PA6-GF25 Technical Data Sheet V1.1 Polymaker · 2024-12 · tds
  2. Bambu Filament Technical Data Sheet — PA6-GF Bambu Lab · 2026-08 · tds
  3. ThermaX PSU Technical Data Sheet v3 3DXTech · 2026-08 · tds
  4. Polymaker product catalogue Polymaker · 2026-08 · vendor
  5. SUNLU Nylon-6 Glass Fiber (PA6-GF) 3D Printer Filament 1 kg — product page SUNLU · 2026-08 · vendor
  6. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  7. YXPOLYER PA6-GF Black 1 kg — product page YXPOLYER · 2026-08 · vendor
  8. Prusament PEI 1010 Technical Datasheet v1.0 Prusa Polymers · 2024-09 · tds
  9. Prusament PEI 1010 — material page Prusa Polymers · 2026-08 · doc
  10. Nylon — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  11. PA (Nylon) — material basics Polymaker Wiki · 2026-08 · doc
  12. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  13. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  14. THERMAX PSU — product page (print recommendations) 3DXTech · 2026-08 · doc
  15. TECASON S natural (PSU) — stock shape properties Ensinger · 2026-08 · tds
  16. Moisture Conditioning — effect on printed nylon properties Polymaker Wiki · 2026-08 · doc
  17. Fiberon PA6-CF20 Technical Data Sheet V1.1 Polymaker · 2024-12 · tds
  18. PolyMide CoPA Technical Data Sheet V5.4 (dry and wet status blocks) Polymaker · 2024-11 · tds
  19. FDM PA6/66-GF30-FR — Material Data Sheet Stratasys · 2026-07 · tds
  20. ThermaX PPSU Technical Data Sheet v3 3DXTech · 2026-08 · tds
  21. TECAMID 66 GF30 black (PA66-GF30) — stock shape properties Ensinger · 2026-08 · tds
  22. 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
  23. Ultramid Nylon Chemical Resistance guide (unmodified PA6 B27E and PA66 A27E) BASF · 2026-08 · tds
  24. Radel PPSU, Veradel PESU, Acudel modified PPSU Design Guide — environmental stress cracking tables Solvay Specialty Polymers · 2026-08 · tds
  25. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds