PETG filament: tougher parts, a few more setup details
PETG is a common choice for functional indoor parts: brackets, organizers, enclosures for small projects, and parts that need a little give rather than snapping. It asks for slightly more setup care than PLA, mainly around stringing, cooling, and how strongly it bonds to some build surfaces.
At a glance
- Typical uses
- Functional indoor parts, clips, containers, outdoor-adjacent use with caveats
- Watch out for
- Stringing, over-strong bonding to smooth PEI
- Hardware
- Most desktop hotends; check the spool's stated temperature range
- Moisture
- Moisture-sensitive: store sealed and dry when the maker recommends it
Everything on PETG
What matters most
Tougher, but grade matters
Manufacturers commonly describe PETG as tougher and more temperature-resistant than PLA. Exact heat resistance and impact figures differ between grades, so compare technical data sheets rather than assuming every PETG behaves the same.
Plan for stringing
Prusa's PETG guide describes it as prone to stringing and suggests adjusting retraction and temperature. Start from a known-good profile for your exact printer and that filament, and change one setting at a time.
Build surface release
PETG can bond too strongly to smooth PEI. Prusa recommends a separation layer such as glue stick on its smooth sheet, or a textured sheet instead. Follow your surface maker's guidance; a torn PEI coating is a costly mistake.
Moisture changes results
Wet PETG tends to string and bubble. Bambu Lab's drying recommendations list PETG among materials that benefit from drying; follow the exact spool's drying instructions and your dryer's limits.
Check before you buy
- Where will the part live: indoors, near heat, or outdoors in sun and rain?
- What does the exact grade's data sheet say about heat resistance and drying?
- Does your build surface's maker recommend a release agent for PETG?
- Can your hotend reach the spool's stated temperature range with margin?
- Do you have a way to keep the spool dry while printing?
Sources
- PETG material guide, Prusa Research
- Smooth steel sheet, Prusa Research
- Filament drying recommendations, Bambu Lab
- Stringing and oozing, Prusa Research