3D Printing Info

Filament comparison

Magnetic vs PLA Metal

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

Magnetic filament guideMetal-filled PLA guide

2 selected · all documented properties

Open these two in the interactive comparisonMore Magnetic comparisonsMore PLA Metal comparisons
Magnetic vs PLA Metal — documented properties and sources
PropertyMagnetic filamentSPECIALTYMetal-filled PLAPLA
Market snapshot
Listing priceUSD/kg; dated snapshots$64.99/kg median; $64.99–$64.99/kg across 1 dated product listings$79.69/kg median; $24.99–$94.99/kg across 6 dated product listings
Identity & Market
Base polymer / chemistryPLA loaded with ferromagnetic iron powder, so printed parts respond to magnets[1]PLA loaded with real metal powder — bronze, copper, steel or iron. Bambu Lab's PLA Sparkle TDS states it has "metal particles included in its composition"; its separately sold PLA Metal does not, and the store page says so explicitly[2][3][1][4][5][6]
Densityg/cm³About 1.85 (Proto-pasta manufacturer figure) — 1.5× standard PLA[1]1.26 (Bambu Lab Sparkle, a trace-metal glitter grade) up to 3.9–4.0 for colorFabb bronze and copper and 2.3 for Proto-pasta steel, ISO 1183[4][2][3][7]
Typical priceUSD/kg1 kg spools cluster near 65[8]1 kg spools cluster near 78[9][10][1]
Price range across brandsUSD/kg64–70 across formats; 1 kg spool 65, 500 g 70, 2 kg 70[8]25–95 across brands; Bambu Lab Sparkle 25, Proto-pasta iron 65, colorFabb bronze and copper 84, Proto-pasta steel 95[9][1][10][7]
Market availability1–5Niche, a handful of specialist brands[8]Available from several mainstream brands[10][1][7][9]
Spool sizes & diameters1.75 and 2.85 mm; 0.1, 0.5, 1 and 2 kg spools[8]1.75 and 2.85 mm; 0.1, 0.5, 0.75, 1 and 1.5 kg spools[8][10]
Typical applicationsSensor targets, magnetic fixtures, and props that need to stick to a magnet or rust deliberately[1]Decorative castings and props that are polished or left to patinate; the density gives prints a metallic heft[2][1]
Printing Parameters
Nozzle temperature°C192 (Proto-pasta)[1]195–220 (colorFabb bronze and copper); 192 (Proto-pasta iron); 198 (Proto-pasta steel); 190–230 (Bambu Lab Sparkle)[2][1][7][4]
Bed temperature°C60 (Proto-pasta)[1]50–60 (colorFabb, Proto-pasta); 35–45 (Bambu Lab)[2][1][4]
Enclosure / chamber requirement1–5Open frame is fine[1]Open frame is fine[2]
Part cooling fanNot documentedOn (colorFabb copper); 0–100 % (colorFabb bronze)[2][3]
Bed surface & adhesion aidNot documentedGlass plate with glue stick or tape (colorFabb)[2][3]
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]1.6–2.4 at Proto-pasta's 20–30 mm/s for iron and steel, 3.2–8 at colorFabb's 40–100 mm/s, on a 0.4 mm nozzle at 0.2 mm layer[1][7][2][11]
Overall printing difficulty1–5Intermediate — dry filament and a tuned profile; slow, and brittle in filament form[1]Intermediate — dry filament and a tuned profile; brittle in filament form and slow to print[1][7]
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]Proto-pasta advises an extrusion width 0.05 mm larger than the nozzle and warns that feeding is inconsistent below 0.4 mm and on Bowden machines[1][7]
Hardware Wear & Reliability
Nozzle hardness required1–4Brass acceptable; hardened steel for volume work[1]Brass acceptable; hardened steel for volume work[1][7]
Abrasiveness1–5Moderately abrasive — metal fill[1]Moderately abrasive — metal fill[1][7]
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[12]Moderate — needs dry filament and a clean nozzle[7]
Hotend requirementProto-pasta recommends a wear-resistant or larger nozzle for longer service intervals[1]Proto-pasta recommends a wear-resistant or larger nozzle for longer service intervals[1][7]
Other hardware wearNot documentedProto-pasta warns of more frequent nozzle replacement and first-layer adjustment[1][7]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Not documentedModerate — the PLA matrix takes up 0.40–0.51 % saturated; the metal powder itself does not absorb water[13][14]
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[15]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[15]
Mechanical Properties
Tensile strength (XY)MPaNot documented25 (colorFabb copper) and 30 (colorFabb bronze), ISO 527-1A; Bambu Lab Sparkle 39 ± 3 printed XY, ISO 527[2][3][4]
Young's modulusMPaNot documented1940 ± 230 printed XY, ISO 527 (Bambu Lab Sparkle)[4]
Elongation at break%Not documented3–10 (colorFabb copper) and 5–10 (colorFabb bronze), ISO 527-1A; 11.7 for Bambu Lab Sparkle printed XY[2][3][4]
Flexural strengthMPaNot documented75 ± 4 printed XY, ISO 178 (Bambu Lab Sparkle)[4]
Flexural modulusMPaNot documented2350 ± 140 printed XY, ISO 178 (Bambu Lab Sparkle)[4]
Charpy impact, notchedkJ/m²Not documented23.2 ± 2.4 printed XY, ISO 179, notched (Bambu Lab Sparkle)[4]
Other impact dataNot documentedIzod notched 4.5 kJ/m² for colorFabb bronzeFill and 10 kJ/m² for copperFill (ISO 180); Charpy unnotched 66.5 kJ/m² for Bambu Lab Sparkle[2][3][4]
Layer adhesion / Z tensileMPaNot documented32 ± 2 printed Z, ISO 527 (Bambu Lab Sparkle)[4]
Brittleness1–5Brittle — Proto-pasta describes the filament as more brittle than standard PLA and needing extra care in handling[1]Brittle — Proto-pasta describes both its iron and steel grades as more brittle than standard PLA in filament form[1][7]
Creep resistance / sustained load1–5Not documentedPoor — no metal-filled creep test; plain printed PLA sagged from 12 to 16.2–21.8 mm over 5 days at 1.25 kg[16][17][18]
Fatigue / repeated-flex resistance1–5Not documentedPoor — no grade-specific S-N curve; plain printed PLA ran 38 000–49 000 cycles at 30 % of tensile strength and Proto-pasta describes its iron and steel grades as more brittle than standard PLA[19][1][7]
Elasticity / flexibility1–5Rigid[1]Rigid[4]
Z strength as % of XY%Not documented82 by tensile (printed, Bambu Lab Sparkle)[4]
Thermal Properties
HDT at 0.45 MPa°CNot documented55 (ISO 75, 0.45 MPa, Bambu Lab Sparkle)[4]
HDT at 1.8 MPa°CNot documented53 (ISO 75, 1.8 MPa, Bambu Lab Sparkle)[4]
Glass transition (Tg)°CNot documented56 (DSC, Bambu Lab Sparkle)[4]
Melting point / Vicat°CNot documented156 peak melt (DSC, Bambu Lab Sparkle)[4]
Environment & Chemical
UV resistance1–5Not documentedDegrades within weeks outdoors[20]
Outdoor durabilityDeliberately rustable — Proto-pasta markets the iron content as oxidising when exposed to moisture[1]Proto-pasta markets its iron grade as rustable — the iron oxidises deliberately when exposed to moisture[1]
Electrical & ESD propertiesFerromagnetic: Proto-pasta states it responds to magnets and behaves similarly to pure iron[1]Proto-pasta magnetic iron PLA is ferromagnetic and responds to magnets[1]
Health & Safety
Fume toxicity1–5Low hazard — minimal VOC and particle emission; none of these materials was in the chamber study[21]Low hazard — minimal VOC and particle emission[21]
Ventilation / filtration requirement1–5Open a window / occasional ventilation[21]None needed in a normal room[21]
Post-Processing
Sanding & machiningPolishing and deliberate rusting are the intended finishes[1]Polishing is the intended finish — colorFabb and Proto-pasta both sell these grades to be sanded and buffed to a metallic shine[2][3][7]
Dimensional accuracy & detailNot documentedcolorFabb notes the metal fill increases die swell, so flow needs raising above plain PLA[3]
Solvents & Solubility
Soluble inChloroform dissolves the PLA matrix and leaves the iron powder behind; laboratory reagent, not workshop stock.[22][1]Chloroform dissolves the PLA matrix (10 % w/v, 2–4 h at 23 °C) and leaves the filler as loose sludge; laboratory reagent.[22]
Softened or crazed byAcetone and ethyl acetate plasticise the matrix rather than dissolving it; water attacks the exposed iron.[22][1]Acetone, ethyl acetate and toluene plasticise the matrix but dissolve <1 % even at 65 °C; acetone submersion crazes parts.[22][23]
Solvent welding & smoothing agentNone — PLA has no workshop-safe solvent, and the iron loading blocks the surface flow smoothing needs.[22]Chloroform vapour attacks only the resin fraction, so the filler is left standing proud; no workshop-safe agent exists.[24][23]

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. bronzeFill technical data sheet colorFabb · 2026-08 · tds
  3. copperFill technical data sheet colorFabb · 2026-08 · tds
  4. Bambu Filament Technical Data Sheet — PLA Sparkle Bambu Lab · 2026-08 · tds
  5. PLA Metal — product page Bambu Lab US Store · 2026-08 · vendor
  6. Bambu Filament Technical Data Sheet V3.0 — PLA Metal Bambu Lab · 2026-08 · tds
  7. Stainless Steel PLA — product page and technical data Proto-pasta · 2026-08 · tds
  8. Proto-pasta product catalogue Proto-pasta · 2026-08 · vendor
  9. PLA Sparkle — product page Bambu Lab US Store · 2026-08 · vendor
  10. bronzeFill — product page colorFabb US · 2026-08 · vendor
  11. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  12. Composite materials with metal or wood particles Prusa Knowledge Base · 2026-08 · doc
  13. Bambu Filament Technical Data Sheet V3.0 — PLA Basic Bambu Lab · 2026-08 · tds
  14. PolyLite PLA Technical Data Sheet V5.4 Polymaker · 2024-11 · tds
  15. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  16. BambuLab PLA Basic vs PLA Tough vs PLA-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  17. Polymaker PLA Pro vs PLA-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  18. Carbon Fiber PLA vs META-PLA vs PLA+ vs PLA by Sunlu — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  19. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  20. PLA — material guide Prusa Knowledge Base · 2026-08 · doc
  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. Solubility Study of Ingeo Biopolymer Grades in Common Organic Solvents (NWPD003) NatureWorks · 2019-10 · tds
  23. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  24. 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