In brief

PLA is the filament most people start with because it prints clean at low temperatures and rarely warps. It is rigid, prints fast, and smells faintly sweet when it melts. The tradeoff is heat. PLA softens at roughly 55 to 60 degrees Celsius, so it is the wrong pick for parts that sit in a hot car or near a heater.

Definition

PLA

noun, polylactic acid

A stiff, low-temperature filament made from plant starches, usually corn. It prints with little fuss on almost any FDM printer and holds fine detail well. It is brittle compared with PETG and loses strength as it gets warm.

How PLA filament melts and flows through a heated nozzle.
The PLA melt path: the extruder pushes filament into the hotend, where it melts and is laid down as a thin bead, one layer at a time. · Marqilo
PLA at a glance

Nozzle temp

190to 220 °C

Bed temp

50to 60 °C

Ease of print

Easy

Rigidity

High

Heat resistance

Low

Layer adhesion

Good

Starting settings for PLA
SettingRecommendedWhy
Nozzle temp205 °CMiddle of the range works for most PLA.
Bed temp55 °CA heated bed helps first-layer stick.
Part cooling100%PLA likes full cooling for crisp overhangs.
Retraction4 to 6 mmDirect-drive can use less; Bowden needs more.
Print speed50 to 80 mm/sSlow the outer wall for cleaner surfaces.

01 How to adjust PLA settings

PLA is forgiving, but a few checks stop most bad prints before they start. Run through these in order when a print goes wrong.

  1. Clean and level the bed

    Wipe the bed with isopropyl alcohol, then level it so a sheet of paper drags lightly under the nozzle at all four corners.

  2. Set the temps

    Nozzle to 205 °C and bed to 55 °C is a safe starting point for almost any PLA.

  3. Turn cooling on

    Run part cooling fans at full speed. PLA needs cooling for sharp corners and overhangs.

  4. Tune retraction for stringing

    If you see fine hairs between moves, raise retraction distance a little at a time.

  5. Watch the first layer

    The first layer should look smooth and slightly squished. Stop and relevel if it is round or patchy.

Avoiddo not

  • Printing PLA near an open window or AC vent, which causes warping and layer splits.
  • Turning part cooling off. PLA needs cooling, unlike ABS.
  • Using a 60 °C-plus bed and no cooling, which softens the part as it prints.
  • Expecting PLA to survive a hot car. It will deform.

02 How PLA compares

PLA is easy but soft and brittle. PLA+ adds toughness. PETG trades some ease for heat and impact resistance. ABS needs an enclosure but handles heat.

PLA versus PLA+ and PETG
PropertyPLAPLA+PETG
Ease of printingbest
Heat resistancebest
Toughnessbest
Enclosure neededNobestNoNo
Green marks the category leader. PLA wins on ease; PETG wins on heat and toughness.
Miniatures, calibration cubes, brackets for indoor electronics, and display models all suit PLA. So do quick prototypes you will iterate fast.

Key takeaways

  • PLA is the easiest filament to print and a strong default for cool, indoor parts.
  • Start at 205 °C nozzle and 55 °C bed, with full part cooling.
  • PLA softens at 55 to 60 °C, so skip it for hot or outdoor load parts.
  • Fix stringing with more retraction and full cooling, not less.

Frequently asked

Is PLA food safe?
Pure PLA resin is food grade, but a printed part is not. Layer lines trap bacteria and the nozzle can leave residue. Use a food-safe coating, or skip PLA for food contact.
Does PLA need an enclosure?
No. PLA prints in the open and prefers active cooling. An enclosure can actually overheat it.
Why is my PLA stringing?
Stringing comes from too little retraction, a slightly high nozzle temp, or wet filament. Raise retraction first, then check the other two.

Read more in the filament glossary, or compare options in PLA versus PETG.

Related guides

Related

More in this area

Cross-reference

Sources & methodology

3 citations · reviewed 2026-07-10
  1. 01NatureWorks Ingeo 2003D technical data sheet (glass transition and softening range)Tier 1
  2. 02PrusaSlicer documentation (default PLA print profile)Tier 1
  3. 03Bambu Studio documentation (default PLA print profile)Tier 1
How we vetted this: every claim traces to a tiered source, Tier 1 (manufacturer, slicer, standards) first. Read the full sourcing and conflict-of-interest policy.