Poor bridging

Strands sag or droop when printing across an open gap.

Likely causes, most likely first

1. Not enough cooling on the bridge
2. Bridge speed not tuned
3. Temperature too high
4. No bridging settings enabled

Fixes to try

• Use maximum part cooling over bridges
• Tune bridge speed (often faster, with 100% fan)
• Lower the temperature slightly
• Enable the slicer's bridging settings; orient to reduce spans

Filaments this hits hardest

Other print defects