3D Printing Info

Filament comparison

ABS-FR vs TPU-CF

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

Flame-retardant ABS (FR-ABS) guideCarbon-fibre TPU guide

2 selected · all documented properties

Open these two in the interactive comparisonMore ABS-FR comparisonsMore TPU-CF comparisons
ABS-FR vs TPU-CF — documented properties and sources
PropertyFlame-retardant ABS (FR-ABS)ABSCarbon-fibre TPUFLEX
Market snapshot
Listing priceUSD/kg; dated snapshots$52.00/kg median; $44.99–$120.00/kg across 5 dated product listings$107.05/kg median; $107.05–$107.05/kg across 1 dated product listings
Identity & Market
Base polymer / chemistryABS with a flame-retardant package; 3DXTech rates the base resin UL 94 V-0[1]Carbon-fibre reinforced thermoplastic polyurethane at the hard end of the range[2]
Densityg/cm³1.18 (ISO 1183) — above unfilled ABS at 1.05 because of the retardant loading[1][3]1.22 (Extrudr FLEX HARD CF, ISO 2781)[2]
Typical priceUSD/kg1 kg-equivalent spools span 45–120; the middle of the market is about 52[4][5][6][7]107 for the only retail listing found (Extrudr 0.5 kg coil, incl. VAT)[8]
Price range across brandsUSD/kg45–120 across brands; SUNLU 45, YXPOLYER 50, Coex 3D 52, 3DXTech 107 at 750 g pricing; the FR PC/ABS grade runs 120[4][5][6][7]One listing only: EUR 49.56 incl. VAT per 0.5 kg coil, direct from Extrudr; no reseller or second brand found[8]
Market availability1–5Niche, a handful of specialist brands[4]Niche, a handful of specialist brands — Extrudr's FLEX HARD CF is the only carbon-filled flexible with a published datasheet found here[2]
Spool sizes & diameters1.75 and 2.85 mm; 750 g spools[4]1.75 mm; 0.5 and 2 kg coils[8]
Typical applicationsElectrical enclosures and transport interiors that must meet a flammability rating[1]Stiffened flexible parts — damping mounts and semi-rigid brackets[2]
Printing Parameters
Nozzle temperature°CNot documented230–260 (Extrudr FLEX HARD CF)[2]
Bed temperature°CNot documented50–90 (Extrudr FLEX HARD CF)[2]
Enclosure / chamber requirement1–5Enclosure recommended[9]Open frame is fine[2]
Bed surface & adhesion aidClean the plate and apply glue; Simplify3D also lists Kapton tape and ABS slurry[9][10]PEI sheet or painter's tape; Polymaker warns TPU can over-stick and advises a glue stick as a release agent[11][12]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented1.6–8 at the 20–100 mm/s Extrudr specifies on a 0.4 mm nozzle at 0.2 mm layer[2]
Warping tendency1–5High — enclosure needed for reliable large parts[9]Not documented
Bed-adhesion difficulty1–5Needs a specific surface plus adhesive[9]Not documented
Stringing / oozing tendency1–5Slight — Polymaker advises 1–2 mm retraction at 20–30 mm/s[13]Not documented
Overall printing difficulty1–5Intermediate — dry filament and a tuned profile[9]Advanced — enclosure, hardware upgrades, tuning; hardened nozzle needed[2]
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely[9]Hardened steel required — Extrudr marks FLEX HARD CF as needing a hardened nozzle where its unfilled FLEX grades do not[2]
Abrasiveness1–5Non-abrasive[1]Highly abrasive — standard CF composite[2]
Nozzle clog risk1–5Low — 3DXTech lists no special nozzle concerns and no minimum layer height for its FR-ABS, only an 80 °C pre-dry[14]High — jams from moisture, heat creep or particles; a flexible base plus chopped carbon fibre, which Prusa lists as a higher nozzle-clogging risk, and Extrudr requires a hardened nozzle[15][2][11]
Heat-creep / jam sensitivity1–5Slightly sensitive[10]Not documented
Hotend requirementNo special hot-end required[10]No special hot-end required, but a direct-drive extruder is (Simplify3D)[11]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Moderate — the ABS matrix takes up 0.51–0.65 % saturated at 25 °C / 55 % RH and 3DXTech specifies a 80 °C, 4 h pre-dry[3][16][14]Moderate[17]
Drying temperature & timeNot documented60 °C for 6 h (Extrudr FLEX HARD CF)[2]
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface[17]Bubbling and popping at the nozzle, stringing and a rough surface[17]
Effect of moisture on strengthPolymaker rates ABS moderate-sensitivity and publishes no dry-versus-conditioned figures; absorbed water flashes to steam in the hotend and shows as bubbling and poor layer adhesion[17]Polymaker groups TPU with the highly hygroscopic materials; no dry-versus-conditioned figures are published[17]
Storage requirementSealed with desiccant; Polymaker rates ABS moderate-sensitivity[17]Sealed with desiccant; often kept in a dryer during the print[17]
Mechanical Properties
Tensile strength (XY)MPa45 at break (printed XY, ISO 527)[1]Not documented
Young's modulusMPa1990 (printed XY, ISO 527)[1]35 (Extrudr FLEX HARD CF, ISO 527-2/5A/500)[2]
Elongation at break%4 at break (printed XY, ISO 527) — well below the 10 % of unfilled 3DXTech ABS[1][18]380 ultimate elongation (Extrudr FLEX HARD CF, ISO 527-2/5A/500), against 490 for the unfilled FLEX HARD[2]
Flexural strengthMPa80 (printed XY, ISO 178)[1]Not documented
Flexural modulusMPa2250 (printed XY, ISO 178)[1]Not documented
Brittleness1–5Moderate — elongation at break falls to 4 % from 10 % for the unfilled grade[1][18]Very ductile — bends far before failing[2]
Hardness (scale-specific)Shore A / Shore D / RockwellNot documented70 Shore D (Extrudr FLEX HARD CF, ISO 868), against 58 Shore D for the unfilled FLEX HARD[2]
Creep resistance / sustained load1–5Moderate — no creep test found; Tg of 105 °C keeps room-temperature service far below softening[1][18]Below average — no CF-grade creep test; the grade is 70 Shore D where a 95A TPU bar crept from 74.5 to 82.7 mm over 5 days at 1.25 kg[2][19]
Fatigue / repeated-flex resistance1–5Below average — no S-N curve found; elongation at break falls to 4 % against 10 % for unfilled 3DXTech ABS[1][18]Good — 380 % ultimate elongation and a damping application set (Extrudr cites longboard wheels), below the unfilled grades[2]
Elasticity / flexibility1–5Rigid[1]Semi-flexible[2]
Wear resistance & frictionNot documentedAbrasion 26 mm³ (Extrudr FLEX HARD CF, ISO 4649-A) — the same as the unfilled FLEX HARD[2]
Thermal Properties
Glass transition (Tg)°C105 (DSC)[1]-24 (Extrudr FLEX HARD CF)[2]
Melting point / Vicat°CNot documentedVicat A 140 (Extrudr FLEX HARD CF, ISO 306)[2]
Flammability / UL 94UL 94 V-0 at 1.5 mm, rated on the base resin rather than the printed part[1]Not documented
Environment & Chemical
UV resistance1–5Not documentedGood — years with some colour shift; Polymaker lists UV exposure among the conditions TPU withstands[12]
Chemical resistanceGood against weak acids, weak alkalis, oils and grease; dissolved by acetone[20]Withstands industrial solvents and UV exposure (Polymaker)[12]
Food contactNot food safe — Polymaker cites potential chemical leaching[13]Not food safe without specific certification (Polymaker)[12]
Biodegradability / compostabilityNot biodegradable[13]Not biodegradable[12]
RecyclabilityMechanically recyclable but not accepted in household plastic collection[13]Not accepted in household plastic collection[12]
Health & Safety
Fume toxicity1–5High — hazardous VOC such as styrene; enclosure and filtration needed[21][9]Low hazard — minimal VOC and particle emission; TPU was not among the nine filaments in the chamber study[21]
VOC emission rateµg/min12–113 styrene, the dominant VOC from every ABS and HIPS combination tested[21]Not documented
Ultrafine-particle emission rateparticles/min2 × 10¹⁰ to 9 × 10¹⁰ median across all ABS printers, two orders of magnitude above PLA's ≈1 × 10⁸[21]Not documented
Hazardous species emittedStyrene dominates. Bambu Lab states ABS and ASA release harmful gases such as styrene at printing temperature, which can be toxic and cause dizziness or nausea[21][9]Not documented
Ventilation / filtration requirement1–5Enclosure with carbon and HEPA filtration — an enclosure alone cut measured UFP by only about 35 %[21][9]Open a window / occasional ventilation[21]
Dust & fibre handling hazardNot documentedCarbon fibre is bound in the matrix; sanding dust should not be inhaled[2]
Post-Processing
Sanding & machiningSands well and takes filler before painting[13]Difficult to sand or smooth; Polymaker limits post-processing to trimming or tumbling[12]
Painting & finishingPaints readily after light abrasion[13]Not documented
Gluing & solvent weldingNot documentedCyanoacrylate bonds TPU; no common solvent welds it[12]
Vapour / chemical smoothingNot documentedNo practical vapour smoothing[12]
Support material pairingHIPS breaks away or dissolves in d-limonene; Bambu Lab sells a dedicated Support for ABS[22][9]Polymaker warns TPU supports are often very difficult to remove[12]
Dimensional accuracy & detailNot documentedTear strength 165 kN/m (Extrudr FLEX HARD CF, ISO 34-1B)[2]
Solvents & Solubility
Soluble inAcetone dissolves it — the basis of ABS slurry; so do MEK, THF, ethyl acetate, chloroform, dichloromethane and toluene.[23][20]DMF, DMSO, NMP and THF dissolve the TPU matrix and leave the fibre; ketones are partial solvents. Laboratory reagents.[24]
Softened or crazed byPetrol and perchloroethylene soften it and benzene attacks it; d-limonene disrupts layer adhesion in some ABS and ASA grades.[23][25]Toluene and benzene swell it up to +50 % by weight at 23 °C; esters swell it severely; ethanol and IPA soften it.[24]
Solvent welding & smoothing agentAcetone: about 20 min of vapour at 80 °C over 5 mm of liquid. Prusa measured layer adhesion more than doubled.[26]None practical — the true solvents (DMF, THF, NMP) are laboratory reagents and leave the joint swollen and weak.[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. Firewire Flame Retardant ABS Technical Data Sheet 3DXTech · 2026-08 · tds
  2. Extrudr Product Catalogue (DURAPRO PA12 data block) Extrudr · 2025-03 · tds
  3. Bambu Filament Technical Data Sheet V3.0 — ABS Bambu Lab · 2026-08 · tds
  4. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  5. SUNLU ABS-FR (ABS Flame Retardant) 3D Printer Filament 1 kg SUNLU · 2026-08 · vendor
  6. YXPOLYER ABS Flame-Retardant product page YXPOLYER · 2026-08 · vendor
  7. Flame Retardant Black ABS Coex 3D · 2026-08 · vendor
  8. Extrudr TPU FLEX Hard CF — product page (1.75 mm, 0.5 and 2 kg coils, price) Extrudr (FD3D GmbH) · 2026-08 · vendor
  9. ABS / ASA / PC Usage Guide Bambu Lab Wiki · 2026-08 · doc
  10. ABS — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  11. Flexible (TPE/TPU) — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  12. TPU — material basics Polymaker Wiki · 2026-08 · doc
  13. ABS — material basics Polymaker Wiki · 2026-08 · doc
  14. FIREWIRE FR-ABS — product page (print recommendations) 3DXTech · 2026-08 · doc
  15. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  16. Polymaker ABS Pro Technical Data Sheet V1 (2026-05-29) Polymaker · 2026-05 · tds
  17. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  18. 3DXMAX ABS Technical Data Sheet 3DXTech · 2026-08 · tds
  19. BambuLab TPU 95A HF vs Qidi TPU 95A HF — results spreadsheet My Tech Fun (Igor Gaspar) · 2024-02 · test
  20. PolyLite ABS Technical Data Sheet (V5.5 served at this URL) Polymaker · 2024-11 · tds
  21. 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
  22. HIPS — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  23. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  24. Elastollan — Chemical properties: swelling and chemical resistance BASF · 2026-08 · tds
  25. HIPS — Knowledge Base Prusa Research · 2026-08 · doc
  26. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc