Nozzle and bed temperature decide whether plastic bonds, strings, or peels. This guide explains why heat matters, how to read manufacturer ranges, and how to run a temperature tower — without treating any number as a universal law.
Prefer looking up a material interactively? Use the Filament Temperature Guide tool for the same starting bands plus calibration notes.
Why temperature matters
Too cold and layers fail to fuse, bridges droop poorly, and under-extrusion appears. Too hot and you get stringing, blobs, heat creep, or a first layer that glosses into a mess. Bed heat controls how the first layers grip and how lower layers stay soft enough to relieve stress.
Nozzle temperature vs bed temperature
- Nozzle (hotend) — melts filament for extrusion and layer bonding
- Bed — keeps the first layers warm for adhesion and reduces early warping on many materials
They are related but not interchangeable. Fixing stringing with bed heat alone rarely works; fixing warp on ABS usually needs both a sane nozzle range and a warm, draft-free environment — see the warping guide.
Typical material starting ranges
| Material | Nozzle (°C) | Bed (°C) | Notes |
|---|---|---|---|
| PLA / PLA+ | 190–220 | 0–60 | Often prints with low or no bed heat on good PEI; cooler nozzle can cut stringing |
| PETG | 220–250 | 70–90 | Moisture-sensitive; dry first if stringing persists |
| ABS | 230–250 | 90–110 | Enclosure strongly recommended |
| ASA | 240–260 | 90–110 | Similar shrinkage story to ABS; check brand TDS |
| TPU (flexible) | 210–230 | 0–60 | Slow speeds; gentle retraction — see stringing guide |
| Nylon (PA) | 240–270 | 70–100 | Dry thoroughly; ranges vary widely by blend |
Source note: aggregated from common consumer filament TDS / on-spool recommendations. Not brand-specific verified lab data. Confirm on your spool before long prints.
How to use manufacturer recommendations
- Read the nozzle and bed band on the spool or TDS PDF
- Start near the middle of that band
- Change temperature in 5 °C steps on a small test
- Do not leave the printed range unless you accept the risk (clog, fumes, weak parts)
- Revisit after changing nozzle diameter, speed, or chamber conditions
Temperature tower workflow
- Slice a temperature tower (or stacked blocks) with known °C steps
- Keep speed, cooling, and retraction fixed for that run
- Inspect layer bonding, overhangs, bridging, and stringing on each step
- Pick the coolest temperature that still bonds well — often the stringing sweet spot
- Save the profile for that filament brand/colour batch
One variable per tower. If you also change retraction mid-test, the result is noise — the stringing article covers that discipline.
How temperature shows up in defects
- Stringing / blobs — often too hot or wet filament
- Poor adhesion / warp — bed too cool, chamber drafts, or first layer Z issues (first-layer guide)
- Weak layer bonding — nozzle too cool or cooling too aggressive
- Glossy / elephant foot — first layers too hot or bed too hot for that material
Moisture and drying
Wet filament pops, strings, and bonds poorly even at “correct” temperatures. Dry PETG, nylon, and many flexibles before blaming the hotend. Store sealed with desiccant; dry only at temperatures the brand allows.
Related tools
Open the Filament Temperature Guide tool for a quick material lookup. Check geometry before long calibration prints with the STL Viewer & Analyzer.