ABS on Prusa MK4

Nozzle Temp

230 °C

Range: 220 – 240 °C

Bed Temp

100 °C

Range: 80 – 110 °C

Print Speed

50

mm/s · max 200

Layer Height

0.20

mm · max 0.28

Fan Speed

10 %

1st layer: 0 %

1st Layer Speed

20

mm/s

Retraction

1.0 mm

@ 35 mm/s

Nozzle Type

Brass

Standard

Retraction Note

• No enclosure by default — ABS is difficult. Add the Prusa enclosure or make your own.

Settings

Recommended

Range

Nozzle Temperature

230 °C

220 – 240 °C

Bed Temperature

100 °C

80 – 110 °C

Print Speed

40 – 60 mm/s

up to 200 mm/s on this printer

First Layer Speed

20 – 25 mm/s

slower is better for adhesion

Layer Height

0.16 – 0.24 mm

0.12 – 0.28 mm

Fan Speed (Normal)

0 – 20 %

–

Fan Speed (1st Layer)

0 %

–

Retraction Distance

1.0 mm

Direct drive

Retraction Speed

35 mm/s

–

Nozzle Type

Brass (standard)

Brass is fine; hardened optional

Dry Filament

80 °C for ≥ 5 h

print from a dry box in humid weather

Enclosure

Required — add one

Required — this printer is open-frame, so an enclosure must be added

Support Material

HIPS, ABS (self-supporting)

–

Printing Notes

ABS needs a stable warm chamber far more than it needs clever settings. Without an enclosure, large parts will warp and split no matter what the slicer says.

Keep cooling near zero. Fan is the enemy of ABS layer adhesion — use it only for small overhangs and bridges.

The Nextruder's short filament path keeps retraction around 1 mm — a fraction of what a Bowden machine needs, and close to PrusaSlicer's stock value.

Input Shaper is enabled by default on the MK4, so the speeds above are achievable without the ringing you would get on an older machine.

Slicer: PrusaSlicer. Dry the filament at 80 °C / ≥ 5 h before a long print — every figure above assumes dry filament.

Troubleshooting

Corners lifting off the bed — Chamber temperature. Close the enclosure, kill the part fan, and add a brim. Bed temperature alone will not fix it.

Cracks between layers halfway up tall parts — The part is cooling unevenly. Raise chamber temperature and drop print speed to 40 mm/s.

Strong smell while printing — ABS emits styrene. Vent the enclosure outdoors or fit a carbon filter — this is a ventilation issue, not a print quality one.