Should I print with PLA or PETG?

Start with PLA. Switch to PETG for parts that need toughness or must survive warmth.

Start with PLA. Move to PETG when a part needs more toughness or must survive warmth, such as a car interior in summer.

PLA

  • Prints at lower temperatures and rarely warps
  • Crisp detail and easy bridging
  • Low odour
  • Softens at fairly low temperatures and can be brittle

PETG

  • Tougher and more flexible, less likely to snap
  • Handles more heat than PLA
  • Tends to string; needs tuned retraction
  • Can stick too well to some smooth build surfaces

Rule of thumb

Decorative pieces, prototypes and models: PLA. Brackets, clips, outdoor parts and anything that flexes or gets warm: PETG.

Store both dry

Filament absorbs moisture from the air. Wet filament pops, strings and prints weak. Keep spools sealed with desiccant when not in use.

These are Lessons 8 and 9 in the course. Ready to print? Try your first print.

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