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  • Collapsing bridges in 3D print

Collapsing bridges in 3D print

3D Printing Help Centre


In the 123-3D help centre, we answer all your questions about 3D software and printer settings, problems you may experience during or after 3D printing and other 3D-related topics

Bridges: the floating parts of my 3D print collapse

Bridges in 3D printing are when you print two connection points of a model that have little or no support between them. Normally, a 3D printer first prints the base layer, on which it builds up the object layer by layer. In contrast, there is no base layer between two points in bridging. The problem with bridges is that they can sag or hang instead of forming straight lines. This is because the tension holding up the bridge is not enough to overcome gravity. This can lead to poor print quality, stringing or even failed prints.

  • Check and adjust your bridge settings in your slicer

    Some slicers have special settings for bridges, such as speed, temperature, fan speed, and angle of the bridge. These settings can help increase tension and reduce deflection.
  • Reduce your print speed and print temperature

    A lower speed and temperature can cause the filament to cool and solidify more quickly, making it less likely to sink. You can also try increasing your fan speed to speed up the cooling process.
  • Change the orientation of your design

    Sometimes you can avoid the problem by repositioning your model on the print bed. You can try to reduce the length or angle of the bridge, or eliminate it altogether by rotating or tilting the model.
  • Check your filament 

    Some types of filament are better suited for bridges than others. In general, stiffer and less flexible materials are better for bridges, such as PLA or PETG. You can also try using a drier filament, as damp filament is more likely to drip or string.
  • Use supports if necessary 

    If none of the solutions above work, consider adding supports to your model. Supports can help supports and stabilise the bridge, resolving the problem. However, you must ensure that you are using the correct support settings and that you can easily remove the supports after printing without damaging the model.

Adjusting any of the above settings will help you create better bridges, with no or less suspension.  

Back to all 3D printing problem FAQs

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