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A model printed in 3D must obey the laws of statics to remain upright. You must avoid structural errors: excessive cantilever, elements too thin to support the weight of the object, etc.
Also consider your desired material’s specifications when creating a printable model (minimum thickness, maximum size, resolution, etc.). You can find all of this information and modeling advice on materials in our materials modeling guide. To learn more about the materials we offer, please refer to our Materials page.
Choose the Unit and Scale for Modeling
There is one critical thing to do before beginning to create a model – you must choose the unit you will use when drawing. To do so, go to the “Units” section of the “Model Info” dialogue box. We suggest that you model in millimeters.
Note: SketchUp does not manage elements smaller than 1 millimeter very well. If your object becomes more complex during modeling, it is unlikely that elements less than 1 mm will be generated. This will result in modeling anomalies. To avoid these pitfalls, we suggest that you design with a larger scale. For example, if you want to draw an object 100 mm wide, draw it with a width of 10,000 mm. You can resize it later by using the “Scale” tool or the “Tape Measure Tool”.
Use SketchUp’s “3D Printing” Model
SketchUp also has a pre-set standard model adapted to 3D printing. You can select this standard model at the beginning of your session in the “Welcome to SketchUp” window.
In SketchUp, objects are hollow and composed of faces (without thicknesses) which, when fused together, create volumes. These faces have a front (white by default) and a back (bluish by default).
Orient the Front Faces to the Model’s Exterior
So that the 3D printer is able to determine the model’s interior and exterior borders, it is important to ensure these faces are properly oriented. To be printable, a model must have all of the front faces oriented visibly outward. For example, if you want to print a cube, its aspect must appear completely white and none of its faces should be bluish. To reverse the faces that are improperly oriented, select them, then right click and choose “Reverse faces”.
Modify the Display Mode to Simplify Viewing of Faces
It may be difficult to view and distinguish the difference between white and bluish on the screen, especially when there are multiple faces. We suggest that you change your display mode so that the back faces display in yellow or bright red. To do so, you need to go into the “Face Settings” section of the “Styles” dialogue box.
View the Inside of Your Model
It may be difficult to view and reverse incorrect faces despite all of the techniques and precautions described above. For example, if you have drawn a tube with a 20mm diameter and a 5mm thickness, it would be complicated to modify the parts of the model located inside the tube. To fix this, we recommend using the “Section Plane” toolbar. It will enable you to see a cutaway view of your design while hiding all the elements located in front of the cutting plane.
Understanding the Concept of Solid
For a group to be considered as a solid in SketchUp:
Nevertheless, even though your volume is
Perform Operations on Solids
To quickly create volumes in SketchUp, you should first start with a 2D polygonal face. You can then add volume to this face by using the following two tools, respectively:
Use this approach to quickly create simple shapes. From these, it is possible to make your model more complex. Simply draw a new polygon on one of the faces and perform another “Push/Pull” or “Follow me” operation.
When a volume is finished, you can make it a group (or a component). Create a component when an element needs to be copied many times in the model or when it will be reused later.
To do so, select all of the elements, right click on the selection and choose “Make Group”.
Many distinct solids can be added between them using the “Outer Shell” tool from the “Solid Tools” toolbar. You need to have the Pro version to perform other operations (intersection, subtraction, etc.).
Check if an Element is Solid
Use of these plugins will be explained in the “Analyze and Export Your 3D File” and “Correct the Most Common Errors” sections.
Complex modeling operations take time in SketchUp. It is also wise to optimize your work by adding plugins (or extensions).
Find and Install the Right Plugins
Plugins are available directly in SketchUp via the “Window – Extension Warehouse” (Window -Extension Warehouse). After logging in with your Google account, you can download and install them directly into the software.
You can also find plugins in the SketchUcation Plugin
The table below contains a list of plugins as well as their type of use.
Name of Plugin
Reverse the faces of the model
Check the model
Correct the model
Clean the model
Optimize the selection
Smooth the angles
Empty the model
Create organic shapes
Import and export in STL format
Smooth the Angles
Models with very sharp angles may be fragile and easily broken. The “Round Corner”
Hollow Out Your 3D Model
The “JointPushPull” plugin allows you to empty your model by doubling its surface
Note: you can also hollow out your model after uploading it to Sculpteo by
Check and Correct Your 3D Model
Using the “SketchUp STL”, “Solid Inspector”, “Solid Solver”, “FrontFace” and “CleanUp 3” plugins will be explained further in the “Analyze and Export Your 3D File” and “Correct
When your model is a solid group, you can apply colors and textures to it using
The colors and textures created will be printed in 3D according to their aspect in the SketchUp model (provided you select a material appropriate for multicolor 3D printing). To learn more about the materials we offer, please refer to our Materials
Please note that some effects created in SketchUp will not print in 3D. For example, by