TPU 95A on Prusa XL

Nozzle Temp

230 °C

Range: 200 – 240 °C

Bed Temp

50 °C

Range: 20 – 60 °C

Print Speed

30

mm/s · max 40

Layer Height

0.20

mm · max 0.28

Fan Speed

20 %

1st layer: 0 %

1st Layer Speed

15

mm/s

Retraction

0.4 mm

@ 25 mm/s

Nozzle Type

Brass

Standard

  Retraction Note

• Minimise retraction for TPU. Use 0.4 mm at a slow 25 mm/s, or turn it off if the filament tangles in the extruder.

Settings

Recommended

Range

Nozzle Temperature

225 – 235 °C

200 – 240 °C

Bed Temperature

45 – 55 °C

20 – 60 °C

Print Speed

30 – 40 mm/s

up to 40 mm/s on this printer

First Layer Speed

15 – 20 mm/s

slower is better for adhesion

Layer Height

0.20 – 0.25 mm

0.15 – 0.28 mm

Fan Speed (Normal)

20 %

0 – 30 %

Fan Speed (1st Layer)

0 %

off

Retraction Distance

0.4 mm

0 – 0.8 mm

Retraction Speed

25 mm/s

20 – 30 mm/s

Nozzle Type

Brass (standard)

Brass is fine; hardened optional

Dry Filament

70 °C for ≥ 5 h

print from a dry box in humid weather

Enclosure

Not required

Not needed for TPU

Support Material

PVA

from a second toolhead

Wipe Tower Minimal Purge

35 – 70 mm³

Prusa suggests up to 70 mm³ for TPU

Printing Notes

TPU 95A is a Shore 95A flexible filament that stretches 800 – 1000 % before breaking, with a 95 °C heat deflection temperature. Use it for dampers, gaskets, couplings and protective cases.

Loading on the XL: Prusa publishes a Flex Filament bypass for the XL that skips the side filament sensor and eases soft filament into the toolhead. Disable the filament sensor while it is fitted.

Slow is the whole trick. Prusa's flexible filament guide gives 20 mm/s as typical and 30 – 40 mm/s as the maximum, and OzFDM rates TPU 95A from 30 mm/s, so we print it at 30 mm/s.

Multi-tool: Prusa suggests raising the minimal purge on the wipe tower as high as 70 mm³ for TPU, which strings readily once it has absorbed moisture. TPU and PLA can share a job for rigid parts with flexible sections.

Slicer: PrusaSlicer with the Prusa XL printer profile and a 0.4 mm nozzle. Dry the filament at 70 °C for ≥ 5 h before a long print; every figure above assumes dry filament.

Troubleshooting

Filament buckles or stops feeding: Slow down, loosen the extruder idler so the gears push the filament gently, and fit the flex filament bypass.

Stringing and blobs: Dry at 70 °C for at least 5 hours, shorten or turn off retraction, and raise the wipe tower purge toward 70 mm³.

Parts fused to a smooth or satin sheet: Apply glue stick as a separation layer, or print on the textured powder-coated sheet, which needs none.