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I made two arms, one of the two being a duplicate with ScaleX =-1. I placed the armature one the right side and used Symmetrize to mirror it on the other side. Then I set parent with automatic weights, but when I go into pose the right arm bends correctly when I move the upper arm bone while the other twists around. I have no idea why it does this. Thanks.

enter image description here

File:

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  • $\begingroup$ Hello could you please share your file? blend-exchange.com $\endgroup$
    – moonboots
    Mar 10, 2023 at 17:24
  • $\begingroup$ How do I do that? $\endgroup$
    – user163847
    Mar 10, 2023 at 17:38
  • $\begingroup$ Read the instructions and share the link here, or use another platform like workupload $\endgroup$
    – moonboots
    Mar 10, 2023 at 17:40
  • $\begingroup$ I added link to file at the end of my post. $\endgroup$
    – user163847
    Mar 10, 2023 at 17:44

1 Answer 1

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Apply the transforms, as you have negative scale values it will flip the normals, you need to recalculate them in Edit mode, then parent again With Automatic Weights and it will work.

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