Temperature Settings

Nozzle temperature controls how easily filament flows and how strongly layers weld together; bed temperature mainly controls first-layer grip and warping. Start in the filament’s recommended ranges, then use a first-layer check and a temperature tower to pick the coolest nozzle temp that still bonds well and the coolest bed temp that still prevents lifting.

TL;DR

Start with the filament’s recommended nozzle/bed range, then tune in 5–10 C steps: pick the lowest nozzle temp that still gives strong layer bonding, and the lowest bed temp that still keeps corners down without elephant foot.

A quick visual map of the main decisions behind temperature settings.

What nozzle temperature really changes

Nozzle temperature sets melt viscosity (how “thick” or “runny” the plastic is as it leaves the nozzle). Too cool for your print speed and line width causes inconsistent extrusion: rough walls, gaps between lines, weak layer fusion, and sometimes clicking/skipping as the extruder struggles. Too hot makes plastic stay liquid longer: more oozing during travel (stringing), blobs/zits, rounded corners, and sagging bridges/overhangs.

What bed temperature really changes

Bed temperature mostly affects the first few layers: adhesion, shrink control, and whether corners lift. A warmer bed keeps the first layer softer so it can “wet” the build surface and shrink more evenly. Too hot can soften the bottom layers for too long, leading to elephant foot (bulged base), a shinier/softer bottom surface, or overly aggressive sticking (common with PETG on some surfaces).

A reliable tuning workflow (fast and repeatable)

Set nozzle and bed temperature to the middle of the filament’s recommended range in the slicer.
Print a small first-layer pattern (squares/lines). Goal: sticks everywhere, lines touch with no gaps, and corners stay flat.
If corners lift or the first layer won’t stick, increase bed temp 5–10 C (and reduce drafts). If the base bulges (elephant foot), lower bed temp slightly and/or reduce first-layer squish (Z offset/first-layer flow).
Print a temperature tower at your normal speeds and cooling. If you don’t have one, print a small stringing + overhang test and change only nozzle temp.
Choose the lowest nozzle temperature that still gives solid layer bonding and smooth, consistent extrusion.
Only after temperature is reasonable, fine-tune retraction, fan, and speed (these can mask the real temperature signal).

Symptom to temperature clues

Stringing and wisps between features

Likely cause: Nozzle temp too high for your travel/retraction/cooling

Fix: Lower nozzle temp 5–10 C; then tune retraction if needed

Layers split apart or parts snap along layer lines

Likely cause: Nozzle temp too low (or too much cooling) reducing fusion

Fix: Raise nozzle temp 5–10 C; reduce fan for materials that need it

Corners lifting / warping during print

Likely cause: Bed temp too low or first layers cooling too fast

Fix: Increase bed temp 5–10 C; reduce drafts; consider a brim

Elephant foot (bulged first layers)

Likely cause: Bed too hot and/or first layer too squished

Fix: Lower bed temp a bit and/or reduce first-layer squish (Z offset/flow)

Rough, sparse top surfaces / poor line fill

Likely cause: Nozzle temp too low for current speed and flow

Fix: Raise nozzle temp 5–10 C or slow down top surface speed

Practical notes for common filaments

PLA: Usually prints at lower nozzle temps with modest bed heat. Too hot tends to increase stringing and gloss; too much fan reduction can hurt overhangs.
PETG: Often prefers a hotter nozzle and a warm bed. Watch for stringing and for over-adhesion to certain beds; use a suitable release layer/surface when needed.
ABS/ASA: Typically needs a warm bed and draft control to prevent warping; an enclosure helps keep temps stable and layers bonded.
TPU: Often needs slower speeds; too hot increases oozing and loss of detail. Keep flow steady and avoid pushing temperature to “fix” a feeding issue.