Compact XY Bridging Test 10-100mm

Test your bridging settings along X and Y with this compact frame, with bridge lengths of 10 to 100mm in 10mm steps.
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updated June 6, 2022

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There are so many bridging test models out there already - why did I make another one? I couldn't find one that met all these criteria:

  • The model should test bridging in both X and Y directions, testing each axis with the same range of bridge lengths.
  • The bridges should all be at the same height above the build plate, so the air temperature and air flow is the same for every bridge.
  • The model should come off the build plate in a single piece.
  • The model should have a frame so it holds together for later reference.
  • The bridge lengths should be labeled for easy reference.
  • The local geometry around each bridge should be approximately the same to equalize how each bridge is affected by variations in air flow.
  • As little plastic as possible should be used.
  • To save time printing the supports, the bridges don't need to be more than a few mm from the build plate.
  • The bridges should be only one layer thick because the first layer of the bridge is the most important.
  • The model should be parametric so the bridge width and thickness can be tuned to match slicer settings.

This is what I came up with. A fully parametric Fusion 360 file is included, should you need to tweak any dimensions.

As exported, the bridges are 2.08mm wide and 0.2mm thick, which works well using a profile with 0.2mm layer height and 0.4mm extrusion width. At these settings and 20% infill, the model uses about 7g of material and takes ~25 minutes to print. With perimeter width at 0.38mm in SuperSlicer, each bridge should have exactly six lines.

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