3D Printing Info

Filament comparison

Magnetic vs PEEK-CF

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

Magnetic filament guideFibre-reinforced PEEK guide

2 selected · all documented properties

Open these two in the interactive comparisonMore Magnetic comparisonsMore PEEK-CF comparisons
Magnetic vs PEEK-CF — documented properties and sources
PropertyMagnetic filamentSPECIALTYFibre-reinforced PEEKHIGHTEMP
Market snapshot
Listing priceUSD/kg; dated snapshots$64.99/kg median; $64.99–$64.99/kg across 1 dated product listings$597.50/kg median; $448.00–$695.00/kg across 5 dated product listings
Identity & Market
Base polymer / chemistryPLA loaded with ferromagnetic iron powder, so printed parts respond to magnets[1]Short-fibre reinforced PEEK. 3DXTech's CarbonX grade is nominally 10 wt% carbon and its FibreX grade 20 wt% glass; LEHVOSS Luvocom 3F PEEK CF 9676 is 15 wt% carbon; Ensinger's machining stock runs to 30 wt% carbon[2][3][4][5]
Densityg/cm³About 1.85 (Proto-pasta manufacturer figure) — 1.5× standard PLA[1]1.39 (ISO 1183)[2]
Typical priceUSD/kg1 kg spools cluster near 65[6]1 kg-equivalent spools span 448–972; the middle of the market is about 598[3][4][7]
Price range across brandsUSD/kg64–70 across formats; 1 kg spool 65, 500 g 70, 2 kg 70[6]448-972 across formats and filler types; IEMAI 3D CF-PEEK and GF-PEEK 448 at 1 kg, 3DXTech CarbonX PEEK+CF10 598 at 2 kg and FibreX PEEK+GF20 695 at 1 kg, Luvocom 3F PEEK CF 9676 648 at 2 kg[3][4][7][8]
Market availability1–5Niche, a handful of specialist brands[6]Niche, a handful of specialist brands[3][4]
Spool sizes & diameters1.75 and 2.85 mm; 0.1, 0.5, 1 and 2 kg spools[6]1.75 and 2.85 mm; 200 g to 2 kg spools[3][4]
Typical applicationsSensor targets, magnetic fixtures, and props that need to stick to a magnet or rust deliberately[1]Stiff aerospace and oil-and-gas parts where PEEK alone is not rigid enough[2]
Printing Parameters
Nozzle temperature°C192 (Proto-pasta)[1]Not documented
Bed temperature°C60 (Proto-pasta)[1]Not documented
Enclosure / chamber requirement1–5Open frame is fine[1]Actively heated chamber required[9][10]
Maximum volumetric flow (mm³/s; see test conditions)mm³/s1.6–2.4 at Proto-pasta's 20–30 mm/s on a 0.4 mm nozzle at 0.2 mm layer[1]Not documented
Warping tendency1–5Not documentedModerate — needs adhesion aid or draught shield; the fibre cuts PEEK's crystallisation shrinkage[2]
Overall printing difficulty1–5Intermediate — dry filament and a tuned profile; slow, and brittle in filament form[1]Expert / industrial hardware only[9][10]
Extruder requirementProto-pasta advises an extrusion width 0.05 mm larger than the nozzle and warns feeding is inconsistent below 0.4 mm and on Bowden machines[1]Not documented
Hardware Wear & Reliability
Nozzle hardness required1–4Brass acceptable; hardened steel for volume work[1]Hardened steel required[2]
Abrasiveness1–5Moderately abrasive — metal fill[1]Highly abrasive — standard CF composite[2]
Nozzle clog risk1–5Moderate — needs dry filament and a clean nozzle; Prusa lists metal-filled composites as a higher clogging risk and recommends a 0.6 mm nozzle minimum[11]High — jams from moisture, heat creep or particles; 3DXTech adds a hardened 0.4 mm minimum nozzle and 0.25 mm layers to the mandatory 120 °C pre-dry[12][13]
Hotend requirementProto-pasta recommends a wear-resistant or larger nozzle for longer service intervals[1]Not documented
Moisture Behaviour
Equilibrium moisture content at ~50 % RH%Not documented0.06 in 24 h on extruded CF30 stock (ASTM D570)[5]
Effect of moisture on strengthPolymaker rates PLA low-sensitivity and publishes no dry-versus-conditioned figures; absorbed water flashes to steam and shows as bubbling and poor layer adhesion[14]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[12]
Mechanical Properties
Tensile strength (XY)MPaNot documented105 at break (printed XY, ISO 527, CF10); 121 at yield on extruded CF30 stock (ASTM D638)[2][5]
Young's modulusMPaNot documented8100 (printed XY, ISO 527, CF10) — more than double unfilled PEEK; 6343 on extruded CF30 stock (ASTM D638)[2][5]
Elongation at break%Not documented3 at break (printed XY, ISO 527), against 28 for unfilled PEEK[2][15]
Flexural strengthMPaNot documented136 (printed XY, ISO 178, CF10); 193 on extruded CF30 stock (ASTM D790)[2][5]
Flexural modulusMPaNot documented8300 (printed XY, ISO 178, CF10); 7171 on extruded CF30 stock (ASTM D790)[2][5]
Other impact dataNot documentedIzod notched 61.9 J/m on extruded CF30 stock, converted from 1.16 ft-lb/in (ASTM D256)[5]
Brittleness1–5Brittle — Proto-pasta describes the filament as more brittle than standard PLA and needing extra care in handling[1]Brittle — snaps with little warning; elongation falls from 28 % to 3 %[2][15]
Hardness (scale-specific)Shore A / Shore D / RockwellNot documentedRockwell M107 on extruded PEEK-CF30 stock (ASTM D785), against M100 unfilled[5][16]
Creep resistance / sustained load1–5Not documentedExcellent — holds load for years. Ensinger rates carbon-fibre PEEK stock as very highly creep resistant and specifies 260 °C continuous service[5]
Fatigue / repeated-flex resistance1–5Not documentedGood. Victrex rates PEEK for long-term fatigue as well as creep; the fibre cuts elongation at break from 28 % to 3 %, which limits repeated large-strain flexing[17][2][15]
Elasticity / flexibility1–5Rigid[1]Rigid[2]
Thermal Properties
HDT at 0.45 MPa°CNot documented265 (printed XY, ISO 75 at 0.45 MPa, CarbonX PEEK+CF10) against 140 for unfilled PEEK[2][15]
HDT at 1.8 MPa°CNot documented316 on extruded CF30 stock, converted from 600 °F at 264 psi (ASTM D648)[5]
Glass transition (Tg)°CNot documented143 (DSC, CarbonX PEEK+CF10) — the fibre does not move the glass transition[2]
Melting point / Vicat°CNot documented334 melting on extruded CF30 stock, converted from 633 °F[5]
Continuous service temperature°CNot documented260 long-term on extruded CF30 stock, converted from 500 °F; 300 short term[5]
Thermal expansion (CTE)µm/m·KNot documented14.4 (extruded PEEK-CF30 stock, ASTM D696; source states 0.80e-5 in/in/°F) — about a third of unfilled PEEK[5][16]
Flammability / UL 94Not documentedUL 94 V-0 on the base resin; Ensinger lists extruded PEEK-CF30 stock as inherently flame resistant[15][5]
Environment & Chemical
Outdoor durabilityDeliberately rustable — Proto-pasta markets the iron content as oxidising when exposed to moisture[1]Not documented
Electrical & ESD propertiesFerromagnetic: Proto-pasta states it responds to magnets and behaves similarly to pure iron[1]Surface resistance above 10⁹ ohm/sq — not static-dissipative (ASTM D257)[2]
Health & Safety
Fume toxicity1–5Low hazard — minimal VOC and particle emission; none of these materials was in the chamber study[18]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[18]
Ventilation / filtration requirement1–5Open a window / occasional ventilation[18]Ventilated room or enclosure recommended[18]
Dust & fibre handling hazardNot documentedCarbon fibre is bound in the matrix; sanding dust should not be inhaled[2]
Post-Processing
Sanding & machiningPolishing and deliberate rusting are the intended finishes[1]Not documented
Solvents & Solubility
Soluble inChloroform dissolves the PLA matrix and leaves the iron powder behind; laboratory reagent, not workshop stock.[19][1]95–98 wt% sulphuric acid dissolves the matrix at 40–70 °C and leaves the fibre. Nothing else touches PEEK.[20][21]
Softened or crazed byAcetone and ethyl acetate plasticise the matrix rather than dissolving it; water attacks the exposed iron.[19][1]Concentrated nitric, hydrofluoric, hydrobromic and hydriodic acids attack it; DCM, DMSO and THF swell thin-walled sections.[22][21]
Solvent welding & smoothing agentNone — PLA has no workshop-safe solvent, and the iron loading blocks the surface flow smoothing needs.[19]None — no solvent softens PEEK, so parts are joined thermally or mechanically, never chemically.[22][21]

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. Magnetic Iron PLA — product page and technical data Proto-pasta · 2026-08 · tds
  2. CarbonX Carbon Fiber PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  3. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  4. 3D4Makers product catalogue 3D4Makers · 2026-08 · vendor
  5. TECAPEEK CF30 black (PEEK-CF30) — stock shape properties Ensinger · 2026-08 · tds
  6. Proto-pasta product catalogue Proto-pasta · 2026-08 · vendor
  7. IEMAI 3D CF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  8. IEMAI 3D GF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  9. Prusament PEI 1010 Technical Datasheet v1.0 Prusa Polymers · 2024-09 · tds
  10. Prusament PEI 1010 — material page Prusa Polymers · 2026-08 · doc
  11. Composite materials with metal or wood particles Prusa Knowledge Base · 2026-08 · doc
  12. CARBONX PEEK+CF10 — product page (print recommendations) 3DXTech · 2026-08 · doc
  13. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  14. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  15. ThermaX PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  16. TECAPEEK natural (PEEK) — stock shape properties Ensinger · 2026-08 · tds
  17. PEEK polymers — product overview Victrex · 2026-08 · doc
  18. 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
  19. Solubility Study of Ingeo Biopolymer Grades in Common Organic Solvents (NWPD003) NatureWorks · 2019-10 · tds
  20. The Effects of Sulfonated Poly(ether ether ketone) Ion Exchange Preparation Conditions on Membrane Properties Yee, Zhang & Ladewig, Membranes 3(3) 182–195 · 2013-07 · paper
  21. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  22. What solvents are not compatible with PEEK? — fluidics technical FAQ IDEX Health & Science · 2026-08 · doc