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A good error prevention practice is to use Edit → Remesh before repairs in order to increase and homogenize the triangulation in the area concerned. Repeat the Bridge command for a few areas around the perimeter of the gap, then use the Inspector to fill the remaining holes. Then hit Edit → Bridge (Ctrl + B) from the popup menu and set the Refine parameter high enough for a smooth connection. Choose Edit → Select and highlight the triangles on both sides to be connected. It works best on straight sections and since this is a gap between circular loops it is best patched up in sections.

In this case, we want to manually connect the gap in one of the struts.

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If all else fails, moving one of the shells by a few hundredths of a millimeter in the Edit → Transform section will do the trick.Īuto Repair All will remove floating sections and patch up all boundary loops. Checking Use Intersection Curves also improves quality. In that case, turn the Search Depth parameter up and lower the Target Edge Scale to increase the chance of success. If the Boolean operation fails it results in two red colored objects. In the newly opened submenu, Precise or Max Quality mode will maintain the intersection curve between both objects, while Fast Approximate is much quicker and usually suffices. Now, progressively select two shells at a time and hit Boolean Union from the popup window. In case the model consists of separate shells, go to Edit → Separate Shells and open the Object Browser (Ctrl + Shift + O). An additional pass with the RobustSmooth sculpting brush will blend the improved area completely into the model. Edit → Make Solid or Edit → Replace and Fill are other alternatives that result in a closed mesh. Setting Type to Smooth MVC produces a good continuous fill. Lastly, Meshlab is a must-have lightweight mesh viewer and editor that makes up for what it lacks in file repair capabilities and user-friendliness with its advanced remeshing scripts.Īn alternative hole repair process is to select the area surrounding the hole and use the Edit → Erase and Fill (F) operation from the popup menu. While Blender is geared more towards 3D modeling and has a complex interface, it still offers most of the required functionalities for successful mesh repairs. Therefore Magics enters the list in third place.

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Magics is a professional STL editor solution and offers an enormous variety of STL file repair functions, yet, it often takes more manual repair work.

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Read our Meshmixer tutorial with 15 pro tips for editing STL files for 3D printing.Īutodesk’s Netfabb distinguishes itself by being geared towards engineers with its advanced 3D printing preparation capabilities.

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Its additional possibilities and free availability make it a clear number one. Meshmixer is also a useful tool to edit STL files, resculpt entire sections, as well as optimize and finalize 3D models. It combines a user-friendly interface with all the options needed to repair complex mesh errors. This typically guarantees model integrity, so use additional tools only when requiring more advanced functions.īased on our explorations, the best STL repair tool is Meshmixer.

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For Formlabs customers, PreForm print preparation software already has Autodesk Netfabb’s automated repair and part packing functions embedded to prepare 3D models upon import. Note: Several software packages contain mesh repair functionalities, such as FreeCAD, SketchUp, 3D Studio Max, and Rhinoceros, as well as online services such as Willit 3D Print, MakePrintable, 3DPrinterOS, SculptGL, and Shapeways. As described in our Meshmixer tutorial, there are several other useful formats such as AMF, Collada, OBJ, and PLY, with specialized qualities for storing material, color, rendering, 3D scanning, and 3D printing information. STL files in a Binary format since it further reduces file size. The most popular and storage-friendly format is STL (StereoLiThography), which we will use for this article. Manual repair by deleting and creating triangles. Stitching open edges and remaining holes. This typically requires recalculating entire portions of the mesh.įiltering out double faces, double vertices, inverted normals, and sharp, narrow triangles. Some comprehensive STL repair programs allow different ways of hole filling, such as planar, tangent, ruled, or freeform. It can contain multiple continuous surfaces that ideally are joined together while obsolete ones need removal.Ĭlosing holes, bridging gaps. A mesh consists of collections of connected triangles. The STL repair software’s wizard will attempt to fix all major errors, including holes, separate shells, and intersections. A typical STL file repair workflow contains the following steps:Īuto-repair.