Adjustable Parameters:

• Inset Width: Set the +/- value to adjust the distance of each concentric outline from the original shape’s boundary.
• Maximum Outline Number: Specify the maximum number of outlines to be generated.

User Guide:

• Activate the add-on.
• Select a flat shape in Blender.
• Configure the parameters: set the 'Inset Width' value and the 'Maximum Outline Number'
• Click on the "Fill with inset" button to generate the inset-outset patterns.

This add-on is an ideal tool for users looking to add intricate detail to their flat designs in Blender, offering precision and versatility in pattern creation.