Compact XY Bridging Test 10-100mm

prusaprinters

<p>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:</p><ul><li>The model should test bridging in both X and Y directions, testing each axis with the same range of bridge lengths.</li><li>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.</li><li>The model should come off the build plate in a single piece.</li><li>The model should have a frame so it holds together for later reference.</li><li>The bridge lengths should be labeled for easy reference.</li><li>The local geometry around each bridge should be approximately the same to equalize how each bridge is affected by variations in air flow.</li><li>As little plastic as possible should be used.</li><li>To save time printing the supports, the bridges don't need to be more than a few mm from the build plate.</li><li>The bridges should be only one layer thick because the first layer of the bridge is the most important.</li><li>The model should be parametric so the bridge width and thickness can be tuned to match slicer settings.</li></ul><p>This is what I came up with. A fully parametric Fusion 360 file is included, should you need to tweak any dimensions.</p><p>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.</p>