{"id":161705,"date":"2021-01-20T10:16:44","date_gmt":"2021-01-20T10:16:44","guid":{"rendered":"http:\/\/facfox.com\/?post_type=kb&p=161705"},"modified":"2021-01-21T08:01:26","modified_gmt":"2021-01-21T08:01:26","slug":"how-to-repair-stl-files-for-3d-printing-with-the-5-best-free-tools","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/how-to-repair-stl-files-for-3d-printing-with-the-5-best-free-tools","title":{"rendered":"How to Repair STL Files for 3D Printing With the 5 Best & Free Tools"},"content":{"rendered":"

Designers and engineers often need software to adapt, repair, and finalize 3D models for 3D printing. Luckily, the era of manual mesh programming is long gone.<\/p>\n

Today, there is a range of dedicated tools available offering both automatic and manual STL repair functions. Automatic wizards will suffice for most models and fix small errors such as holes and loose shells, but models with more critical errors will require a standalone solution.<\/p>\n

In this guide, we describe the workflow for repairing STL files and walk through the process with five of the best STL repair software tools for fully repairing models towards 3D print-readiness.<\/p>\n

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Why Repair an STL File?<\/h2>\n<\/div>\n
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3D designers typically construct models using elaborate surfacing methods. This results in mathematically \u2018perfect\u2019 geometry defined by curves and splines. For 3D printing, surfaces are converted to a mesh format that describes geometry as a cloud of connected triangular faces and vertices.<\/p>\n

Mesh conversion is like smashing a perfectly smooth mirror, then gluing back together all the bits and pieces to make it look like the original. Done badly, the result is a model with all kinds of edges, holes, and floating parts, as well as areas with many intersecting triangles that do not belong there. Done well, the 3D print is a manifold mesh without holes, indistinguishable from the original design.<\/p>\n

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A 3D model mesh with various flaws.<\/figcaption><\/figure>\n<\/div>\n
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How to Repair an STL File<\/h2>\n<\/div>\n
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A typical STL file repair workflow contains the following steps:<\/p>\n

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  1. Auto-repair.<\/strong> The STL repair software\u2019s wizard will attempt to fix all major errors, including holes, separate shells, and intersections.<\/li>\n
  2. Separating shells.<\/strong> A mesh consists of collections of connected triangles. It can contain multiple continuous surfaces that ideally are joined together while obsolete ones need removal.<\/li>\n
  3. Closing holes, bridging gaps.<\/strong> Some comprehensive STL repair programs allow different ways of hole filling, such as planar, tangent, ruled, or freeform.<\/li>\n
  4. Resolving overlaps and intersections.<\/strong> This typically requires recalculating entire portions of the mesh.<\/li>\n
  5. Filtering out double faces<\/strong>, double vertices, inverted normals, and sharp, narrow triangles.<\/li>\n
  6. Stitching <\/strong>open edges and remaining holes.<\/li>\n
  7. Manual repair<\/strong> by deleting and creating triangles.<\/li>\n
  8. Remeshing<\/strong> to optimize triangle count.<\/li>\n
  9. Exporting<\/strong> to the chosen mesh format.<\/li>\n<\/ol>\n

    The most popular and storage-friendly format is STL (StereoLiThography), which we will use for this article. We recommend saving the STL files in a Binary format since it further reduces file size. As described in our Meshmixer tutorial<\/a>, 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.<\/p>\n

    Note: <\/strong>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.<\/em><\/p>\n

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    Compare Software Tools for Repairing STL Files<\/h2>\n<\/div>\n
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    \n\n\n\n\n\n\n\n\n\n<\/tfoot>\n<\/table>\n<\/div>\n<\/div>\n
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    Based on our explorations, the best STL repair tool is Meshmixer. It combines a user-friendly interface with all the options needed to repair complex mesh errors. Its additional possibilities and free availability make it a clear number one.<\/p>\n

    Meshmixer is also a useful tool to edit STL files, resculpt entire sections, as well as optimize and finalize 3D models. Read our tutorial with 15 pro tips for editing STL files for 3D printing<\/a>.<\/em><\/p>\n

    Autodesk\u2019s Netfabb distinguishes itself by being geared towards engineers with its advanced 3D printing preparation capabilities.<\/p>\n

    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. Therefore Magics enters the list in third place.<\/p>\n

    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.<\/p>\n

    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.<\/p>\n<\/div>\n

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    Advanced STL Repair Software Tutorials<\/h2>\n<\/div>\n
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    The following section puts the five STL repair tools to the test using a complex 3D model of a coat hook that has several major errors including holes, gaps, intersections, and floating triangles. The hook needs to be combined with a mounting cylinder to result in a single watertight mesh.<\/p>\n

    Read on to walk through the step-by-step repair process with the five best STL repair programs.<\/p>\n<\/div>\n

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    Table of Contents:<\/h4>\n<\/div>\n
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    <\/th>\nEFFECTIVENESS<\/th>\nEFFICIENCY<\/th>\nUI<\/th>\nVERSATILITY<\/th>\nREMESHING<\/th>\nAUTO-FIXING<\/th>\nTOP FEATURES<\/th>\nWHO IS IT FOR?<\/th>\nCOST<\/th>\n<\/tr>\n<\/thead>\n
    Meshmixer<\/th>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\nUI, Remesh, & Auto-Fix<\/td>\n3D Artists<\/td>\nFree<\/td>\n<\/tr>\n
    Netfabb<\/th>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\nInfill & Supports<\/td>\nEngineers<\/td>\nFree (edu)<\/td>\n<\/tr>\n
    Magics<\/th>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\nManual Repairs<\/td>\nEngineers<\/td>\nPaid<\/td>\n<\/tr>\n
    Blender<\/th>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605<\/td>\n\u2605\u2605<\/td>\n\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605<\/td>\n<\/td>\nCG Artists<\/td>\nFree<\/td>\n<\/tr>\n
    Meshlab<\/th>\n\u2605\u2605<\/td>\n\u2605<\/td>\n\u2605<\/td>\n\u2605\u2605\u2605\u2605<\/td>\n\u2605\u2605\u2605\u2605\u2605<\/td>\n\u2605<\/td>\n<\/td>\n3D Scanning<\/td>\nFree<\/td>\n<\/tr>\n<\/tbody>\n