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PETG vs PLA Which Filament To Choose For Each Job

· 2 min read 3d-printingplapetgmaterials

PLA and PETG are the two filaments most people actually keep loaded. They print at similar temperatures but behave very differently once the part leaves the desk. Choosing right up front beats reprinting in the other material later.

What you need

  • A spool of PLA and a spool of PETG
  • A filament dryer or dry box for the PETG
  • Slicer profiles for each material with matching temperatures
  • A known use case: decorative, functional, outdoor, or load-bearing

Step by step

  1. Ask whether the part will see heat. PLA softens around 55-60 degrees C, so dashboard mounts and dishwasher items need PETG, which holds shape past 80 degrees C.
  2. Ask whether the part lives outdoors. PLA degrades under UV and humidity within months; PETG handles weather far better.
  3. Ask about loads. PETG flexes and deforms rather than snapping, making it better for brackets and clips. PLA is stiffer, which suits rigid frames that should never bend.
  4. Consider layer bonding. PETG welds layers together much stronger, so tall parts printed vertically survive impacts that shatter PLA along layer lines.
  5. Check your printer's capability. Both run fine on open frames, but PETG benefits from slower speeds and a hotter bed, typically 80 degrees C versus 60 for PLA.
  6. Dry the PETG before judging it. Damp PETG bubbles, strings badly, and produces weak layers; 4-8 hours at 65 degrees C fixes it. PLA tolerates ambient air much longer.
  7. Tune the first material switch: raise nozzle temperature roughly 20 degrees C going from PLA to PETG, disable cooling fan above the first few layers, and expect stringing until retraction is tuned.
  8. Default rule of thumb: prototypes, models, and paint-holders get PLA; anything mechanical, warm, wet, or outside gets PETG.

Common mistakes

  • Printing PETG straight from a spool that sat open for months, then blaming the brand for weak prints.
  • Using PLA for parts inside a car or near electronics that warm up.
  • Assuming higher price means harder material; PETG is usually cheap, just fussier about moisture and cooling.

Related guides

Whichever material wins, accurate flow matters, so run through [[dial-in-extrusion-multiplier]] for each new spool. PETG's stringy nature makes support removal different, which [[supports-that-snap-clean]] addresses directly.

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