Poor bridging (sagging spans)
Horizontal spans sag or droop instead of forming a clean flat bridge.
Easy bridging sagging bridges droopy overhangs
Likely causes
- Cooling too weak
- Print speed over bridges too slow or too fast
- Nozzle temperature too high
- Too much flow
How to fix it
- Maximise part cooling for bridges (100% fan for PLA).
- Set bridge speed around 30–45 mm/s and bridge flow to ~90%.
- Drop nozzle temperature 5–10 °C for bridges.
- Reduce bridge line width slightly.
Work through it in order
The fastest path to a fix
Change one thing at a time and print a small test. Start with the first fix listed — it is the most common cause.