The Thickening properties construct a mesh offset based on the object's render mesh.
Steps
Turn on Thickening in the Properties panel > Thickening.
Specify the options.
Thickening Properties
Manages thickening properties for the selected objects.
On Turns the thickening display on and off.
Settings
Distance: Sets the thickening distance.
Offset only: Moves the mesh a specified distance from the existing geometry.
Solid: Fills the edges between the original and new mesh to create a closed mesh.
Both sides: Draws the object on both sides of the object, creating the thickness twice as thick as you indicate.
For more information, please refer to the Rhino documentation.
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