Weak or Spongy Infill
Easy to Fix
The internal infill structure is weak, spongy, or poorly formed, weakening the entire print.
What Does It Look Like?
Print feels weak or flexible
Infill pattern poorly formed
Gaps in infill structure
Print crushes easily
Common Causes
Infill speed too fast
Under-extrusion
Infill percentage too low
Wrong infill pattern
Solutions (Try in Order)
Start with Priority 1 solutions. Make one change at a time and test between changes.
1
Slow Down Infill Speed
Allows proper material deposition
Infill speed: 60-80mm/s (or match perimeter speed)
1
Increase Infill Percentage
More material creates stronger structure
Use 20-30% for functional parts
2
Increase Extrusion for Infill
Compensate for under-extrusion
Infill extrusion multiplier: 102-105%
2
Change Infill Pattern
Some patterns are stronger
Try Grid, Triangle, or Gyroid for strength
3
Increase Infill Overlap
Better bonding with perimeters
Infill/perimeter overlap: 25-30%
Prevention Tips
- Save working settings for each filament type
- Perform regular printer maintenance
- Keep filament dry and stored properly
- Re-level bed before important prints
- Start with manufacturer-recommended settings
At a Glance
Severity:
MEDIUM
Difficulty:
Easy
Category:
Extrusion Issues
Solutions:
5