Medium 15-30 min PLAPETGABSASA

Poor Bridging

Plastic sags or droops when printing across open gaps without support.

Poor Bridging example 1
Poor Bridging example 2
Poor Bridging example 3

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Likely causes

Bridge speed or flow is wrong
Use slicer bridge settings. Lower bridge flow slightly and use a moderate bridge speed so strands stretch cleanly.
Cooling is insufficient
Increase fan for bridges, especially with PLA. PETG may need a balance between cooling and layer adhesion.
Bridge distance is too long
Reorient the model, add support, or split the part if the unsupported span is too large.

Recommended settings by material

MaterialNozzleBedFan
PLA 195-210 C50-60 C80-100%
PETG 230-245 C70-80 C30-60%
TPU 220-235 C40-50 C30-50%
ABS 240-260 C95-110 C0-30%
ASA 240-260 C95-110 C0-30%

Prevention tips

Change one setting at a time and reprint a small test piece.

Keep filament dry and store open spools in sealed bags or dry boxes.

Clean the build plate regularly and verify the correct slicer profile before long prints.

Related problems

StringingWarpingFirst Layer Not Sticking

Last reviewed Jun 15, 2026. Troubleshooting content is for reference only.