How to make a mirror copy of a 3D feature in SolidWorks?
Short Answer
Yes — in SolidWorks, the standard way to make a mirror copy of a 3D feature is with the Mirror feature, using a plane or planar face as the mirror reference. Select the feature to mirror and enable options like merge solids if needed. Limitation: features that depend on one-sided references may fail.
What You Need to Know Before
Warning: Mirrored features often fail when the original feature uses external faces, edges, or sketch relations that do not resolve correctly across the mirror plane. Multi-body parts can also produce unexpected separate bodies if Merge solids is not enabled.
How to Make a Mirror Copy of a 3D Feature in SolidWorks
Command: Mirror
Shortcut: No default keyboard shortcut
Quick Steps:
- In the CommandManager, go to Features tab > Mirror, or use Insert > Pattern/Mirror > Mirror.
- In the PropertyManager, select a Mirror Face/Plane, then choose the feature under Features to Mirror.
- Turn on a needed option such as Geometry pattern or Merge solids, then click OK.
Variables & Settings
Key Setting: Geometry pattern
Expert Setting: This option mirrors the feature geometry without rebuilding some end conditions and references the same way as the original. It is faster and more stable for simple mirrored cuts, bosses, and patterns, but it may not work correctly for features with complex end conditions or dependent references.
Why it Fails
Cause 1 (Geometry): The original feature depends on sketch planes, model edges, or terminating faces that do not exist symmetrically on the other side of the mirror plane.
Cause 2 (layers/Locks): In an assembly or derived workflow, the part may be read-only or externally referenced, preventing edits to the mirrored feature definition.
Cause 3 (Command/Logic): The wrong mirror input was selected, such as mirroring faces instead of features, or Merge solids was left off in a multi-body part.
Quick Fix & Best Practice
Quick Fix: Edit the original feature so it references stable planes and sketches, then rerun Mirror with Geometry pattern enabled if available.
Manager’s Verdict: Use Mirror for symmetric design intent and fast rebuilds. Avoid it when the original feature is poorly constrained or when independent left/right edits will be needed later.
FAQ
Can I mirror multiple features at once in SolidWorks?
Yes, you can select several items in Features to Mirror.
Can I mirror a feature across a model face?
Yes, if the face is planar.
Why did my mirrored feature create a separate body?
Because Merge solids was not enabled or the geometry did not intersect.
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