If your mesh polygon number is higher than 1,000,000, the file will be unwieldy and difficult to print. Here are the most common problems and solutions: Too Many Polygons In the STL Export Options dialog box, set the file type as Binary and click OK.Įven with the recommended settings, your STL mesh may have errors that make it unsuitable for 3D printing.
For millimeter unit models try 0.1 to 0.01. Maximum Distance edge to Surface: Less than half of the printer’s resolution.These are the specific settings recommended for 3D printing: There are simple controls and detailed controls – always select detailed controls.To perform Rhino to STL export, follow these steps: However for 3D printing, the model must be exported as a mesh model. Rhino software creates a NURBS solid model. Pro-Tip: If you want to see what others are making using Rhino 3D, check out the gallery on the Rhinoceros website - there are some pretty cool designs in there! Creating and Exporting a Mesh Using Osnap helps to prevent open curves, a common source of bad objects.Use the Rebuildedges command to recreate the deleted surface. Explode detected bad objects and use the Selbad or Extract Bad Surfaces commands to delete specific bad surfaces.If this doesn’t work, that means there are NURBS structural problems in the model. Many bad surfaces can be fixed by exploding and rejoining the model.This runs in the background and instantly detects bad objects and corrects objects instantly. Use the ‘Checknewobjects’ command to verify objects as they are created.Make sure to save your NURBS model before this operation as it is difficult or impossible to reverse. In Rhino 3.0 Service, Release 4.0: Under Bonus Tools you will find ‘FillHole’ and ‘FillHoles’ to fix naked edges in the mesh. SelectShow Edges → Naked Edges as before. Your NURBS model can be converted to mesh with the Mesh command.If precision is not important, the JoinEdges command can be used to join surfaces forcibly, however it’s better to recreate the bad surface.Created surfaces and existing surfaces must be within model tolerance to join correctly. Naked edges due to missing surfaces are easily corrected by filling in the hole with a new surface and joining the new surfaces together.Select Analysis → Show Edges → Naked Edges to display naked edges in your object.
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To close open polysurfaces in Rhino (or convert open polysurface to solid in Rhino), you first find them by selecting Analyze Direction → Show Edges → Select Open Polysurfaces, and then follow the steps below: How To Prevent and Fix Naked Edges
To achieve a watertight model, you need a closed polysurface. Naked Edges are surface edges not connected to other surface edges, which create open meshes that cannot be 3D printed.įor successful 3D prints, the 3D model should be watertight, meaning if you dropped the model in a bath, no water would get inside. Bad Objects are those that violate NURBS (Non-Uniform Rational B-Splines) rules or have structural problems - they often appear after joining and Boolean operations. The most common reason models become unprintable is due to bad objects and naked edges. Pro-Tip: Check out our guide on How to Conduct a Tolerance Analysis for 3D Printed Parts if you have complex tolerance requirements and want a simple way to perform a tolerance analysis. No matter what units you use to create your model, files exported from Rhino are almost always read as mm, so set your units to mm before exporting your file for printing. Rhino file tolerance can be set from the document properties window in the units tab. A good rule of thumb is to set your Rhino tolerance to be 10 times that of the printer tolerance (i.e printer tolerance is 0.1mm, so Rhino tolerance should be set to 0.01mm). You first need to set correct tolerances before you start modeling by finding the tolerance of the program you are exporting your model to.
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