Uv unwrapping error

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You mean this large finger and other are very small (left island).

  • Be sure your mesh scale is 1 (Ctrl a - apply scale)
  • Be sure your mesh normals are inside OUT for the complete mesh
  • Try the basic unwrap without tweaking things (options/ parameters)
  • Try other UV-map methods
  • You can manipulate the UV-mash by your self - Select and scale / move / reposition.
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It’s the lack of seams in the fingertips - Blender is struggling with the fingertip corners, for the same reason it struggles with the corners of a cube. As a quick experiment to confirm, try seaming the entire face for each fingertip, then unwrapping.

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