Polymaker Fiberon PA612-CF15: problems, parts and running costs
Checked: 2026-10-25
Summary
A 15% carbon-fiber PA612 (long-chain nylon) filament for functional parts, with 91.9 MPa dry XY tensile strength and 175 °C HDT at 0.45 MPa, but it needs a 250-300 °C hotend, a hardened nozzle, drying at 100 °C for 10 h and annealing at 100 °C for 16 h. Owners report strong, stiff, dimensionally stable parts with a matte finish and good AMS compatibility, at the cost of mandatory drying and annealing, high-speed quality loss and cardboard-spool pinching.
Common problems and fixes
- Requires high-temperature hardware — printing needs a 250-300 °C hotend and a hardened 0.4 mm or larger nozzle; brass nozzles wear in about 9 h. Not a warranty item, it is a hardware requirement. [1][3][5]
- Drying is effectively required — despite lower-moisture claims, moisture re-absorption undersizes holes and degrades print quality; dry at 100 °C for 10 h (or PolyDryer level 3 for 18 h) and store below 20% RH. [1][3][5]
- Annealing adds a post-processing step — anneal at 100 °C for 16 h, then moisture-condition 48 h, to reach rated strength. [1][2][3][5]
- Cardboard spool pinching and breakage — filament can pinch against the inner wall after 25-30% use, with breakage reported on about 7-8 of 20+ 0.5 kg rolls. [1]
- Filled nylon is more brittle than PA6 — impact strength is lower than PA6, so it is not the choice for impact-loaded parts. [5][6]
- 0.4 mm nozzle clog risk is debated — some owners report no clogs with 0.4 mm nozzles, others expect higher risk. [7]
- Moisture re-absorption degrades parts — holes can undersize and print quality drops if the filament is not kept dry. [5]
Parts and consumables
- Hardened / wear-resistant nozzle (0.4 mm or larger) — replacement wear item; brass lasts about 9 h with this abrasive material. [1][3]
- Filament dryer — needed to dry at 100 °C for 10 h (or PolyDryer level 3 for 18 h) before printing. [1][3]
- Glue stick or Magigoo PA — adhesion aid used by owners for bed adhesion. [1][5]
- Annealing oven time and electricity — post-processing cost, not a part, but a recurring running cost. [1][5]
Yearly running cost
Not enough data to compute a yearly figure. No subscription or lock-in is reported [1][5]; consumables such as a hardened nozzle, filament dryer, glue stick or Magigoo PA, and annealing oven time and electricity are one-off or unquantified in the sources [1][5].
When it is a good buy
At the Polymaker shop (2026-10-25): $34.99 for 0.5 kg and $49.99 for 1 kg, about $70.00/kg and $50.00/kg respectively [1]. Below $34.99 for 0.5 kg it is positioned as an accessible engineering filament next to alternatives above $100 per spool [5]. The case weakens above $50 for 1 kg unless you already own a 250-300 °C hotend and a dryer [5]. Users needing higher impact strength may prefer a PA6-based nylon [5][6]; users without high-temperature hardware may prefer a lower-temperature grade such as PA12-CF10 [2].