Composite TPU (CF / GF filled) print settings

Composite TPU (CF / GF filled) prints at about 235 °C with a 50 °C bed and 30% part cooling. Usable range 220–250 °C nozzle, 30–60 °C bed. Abrasive — needs a hardened nozzle.

TPU-CFTPU-GFCarbon Fibre TPUGlass-Filled TPUReinforced TPU

Starting settings

Nozzle: 220–250 °C (start 235)
Bed: 30–60 °C (start 50)
Part fan: 0–50% (start 30%)
Wall speed: 15–35 mm/s
Max volumetric flow: 4 mm³/s
Shrinkage: 0.5%
Softens at: -30 °C
Enclosure: Not needed
Nozzle size: 0.4 mm or larger — 0.6 mm recommended
Nozzle material: Hardened steel required — this is abrasive
Drying: 55 °C for 6 h

Speed

Slightly faster than unfilled TPU of the same hardness, 15–35 mm/s, because the fill stiffens the filament and it buckles less readily in the drive gear.

Bed surface

Clean smooth PEI at 50 °C.

Nozzle

HARDENED steel, and 0.6 mm. Chopped fibre in a flexible carrier is unusually hard on a nozzle, and a worn one shows up here as inconsistent extrusion long before it looks worn.

What bites people

Needs a hardened nozzle. Brass will not survive a spool, and the wear is invisible until every dimension has drifted.
Stiffer and tougher than unfilled TPU at the same shore rating — the fill trades elasticity for impact resistance and wear.
Feeds more easily than plain soft TPU for the same reason, which makes it a reasonable flexible to attempt on a Bowden machine.
Layer adhesion suffers where fibres bridge a layer line. Print hotter than you would the unfilled version.

Safety

Nozzle above 220 °C.
Abrasive fill — do not print through a brass nozzle.

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