[Blender Add-on] Mirror Bones & Weights - One Click!

Mirror bones and their weights with one click!

How to use:

1. Navigate to the "Mirror tools" tab in the sidebar (Press N, in case it's hidden)
2. Select the Direction
3. Bones need to end with .R or .L (You can use the "Auto-Name Left/Right" function to add the suffix)
4. In Object mode, select the Object you want to mirror the weights of
5. Hit the "Mirror Bones & Weights" Button
6. That's it ✅

Note:

The "Mirror Bones & Weights" button mirrors all vertex groups/weights of the selected object that have a .L or .R suffix (depending on the direction). Be aware of this if you only want to mirror specific bones.

How to install:

1. Open the Blender preferences window (Edit -> preferences)
2. Go to the Add-ons tab.
3. Click on the top right arrow -> Install from disk
4. Select the downloaded "MirrorWeights_Plugin.py" file
5. Done ✅

Tested in Blender 4.3.2
Should work in earlier version as well.