Simple unwrap plugin for hard surface models in Blender, base idea in this video https://www.youtube.com/watch?v=Fr2SX1rZZM0
- in Edit Mode, Select -> Select Sharp Edges, the default 30 degrees is fine
- you can remove one side of seam on chamfers
- merge islands where the faces are a continuous loop or strip (remove all but one seam for loops)
- check for any edges in the selection that seem disconnected/out of place/don't need it
- download from the release folder and install and enable as any other plugin in Blender
- select the model, enter the edit mode, "simple unwrap" panel would appear on the left, use it to run the plugin
- edit additional settings in the popup to match your model needs
- done