HTPLA Composite Carbon Fiber by Protopasta

Proto-pasta Carbon Fiber Composite HTPLA is a combination of milled carbon fibers and high-performance PLA

Product information

Warning! May cause cancer or reproductive harm.

Proto-pasta Carbon Fiber Composite HTPLA is a combination of milled carbon fibers and high-performance PLA. Resulting 3D printed prototypes and end-use parts are characterized by exceptionally stability of form and potential use up to 155 deg C (310 deg F) when heat treated.

Adaptable to most PLA-compatible printers. Heated bed recommended for process ease, quality, and reliability, but not required. Printer should allow 3rd party filament, parameter adjustment, and nozzle replacement. Specialized machine adaptation and maintenance may be required for Proto-pasta materials particularly in continued use of abrasive materials.

  • Base material: Heat treatable PLA w/ high temp resistance
  • Characteristics: low odor, non-toxic, renewably-sourced
  • Molecular structure: Amorphous or partially crystalline
  • Amorphous as printed, part crystalline when heat treated
  • Melting resets crystalline structure to amorphous state
  • Additives: 10% by weight high-purity, milled carbon fiber
  • Max particle size: 0.15 mm (may limit resolution)
  • Density: approx. 1.3 g/cc
  • Length: approx. 360 m/kg (1.75 mm) & 136 m/kg (2.85 mm)
  • Min bend diameter: 40 mm (1.75 mm) & 100 mm (2.85 mm)
  • Glass transition (Tg) onset: approx. 60 deg C (140 deg F)
  • Melt point (Tm) onset: approx. 155 deg C (310 deg F)
  • Max use: Tg for amorphous, Tm for crystalline
RoHS compliant - Does not contain Cadmium (Cd), Lead (Pb), Mercury (Hg), Hexavalent Chromium: (Cr VI), Polybrominated Biphenyls (PBB), Polybrominated Diphenyl Ethers (PBDE), Bis(2-Ethylhexyl) phthalate (DEHP), Benzyl butyl phthalate (BBP), Dibutyl phthalate (DBP), or Diisobutyl phthalate (DIBP)

Regarding food contact - though base resin may be safe for food contact, our process & additional ingredients may not be. Thus our materials are not certified for food contact even if the risk is low. Please consider additional coatings, treatments & testing before pursuing extended food contact or certification.

Regarding skin contact - Not a known skin irritant, however, avoid recommending prolonged skin exposure without further testing.


  • Available in 1.75 & 2.85 (3.00) mm diameters
  • 50 g loose coil, 500 g on cardboard spool & 3 kg on plastic spool
Some machines may require specific considerations for filament placement, path, adjustments, settings, or other preparation & maintenance.
  • Spool should unwind with minimal resistance
  • Mount filament above machine or other unobstructed position
  • Filament path must not bend tighter than min bend diameter
  • Filament should remain clean, dry & dust-free
  • Check weight before printing to avoid material run out
  • Be careful not to place printer too cool or warm environment
  • Clean print surface with alcohol or water
  • Apply & reapply appropriate adhesion aid as required
  • Carefully control first layer gap for adhesion without jamming
  • Limit build rate to balance melting, cooling & movement limits
  • Adjust layer fan to balance part & nozzle cooling
  • Isolate/insulate heater block from layer fan for consistent heating
  • Maintain & replace nozzle & other components when worn
Product label suggest temperatures as a guideline based on typical nozzle set points. Appropriate settings can vary widely & in given good conditions, a wide range of temperatures can yield positive results. With relatively low print rates on hardware without hangups, HTPLA prints well at the low side of the recommended range. With high print rates on machines with hardware hangups, higher than labeled temperatures may be required for consistent extrusion. In some cases, oiling filament makes the difference between success & failure.

Prusa MK3-specific, Carbon Fiber HTPLA process recommendations:

  • 1st layer temp to overcome jamming on Prusa MK3: 255 deg C
  • Min temp to avoid jamming @ 9 cubic mm/s: approx. 240 deg C
  • Max recommended volume flow @ 240 deg C: 9 cubic mm/s
  • Min recommended volume flow @ 240 deg C: 1.5 cubic mm/s

HTPLA is a semi-crystalline grade of PLA optimized for heat treating (also known as annealing or crystallizing) for higher temperature use. Without heat treating, "as printed" amorphous PLA loses significant stiffness (and the thus the ability to retain form) as the material approaches it's relatively low glass transition temperature. Heat treating creates a more crystalline molecular structure for maintaining stiffness to near melting, thus extending the useful range of HTPLA, but crystallization also creates shrinkage. HTPLA parts should be scaled in slicer to compensate for shrinkage when heat treating.

  • Typical heat treat temp: 95-110 deg C (200-230 deg F)
  • Typical heat treat time: 10+ minutes
For more on the subject of printing, consider our getting started guide.


Technical Specifications

Brand Proto-pasta
Weight 0.037kg


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