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: Go to the Modifier Properties tab (wrench icon) and select Solidify from the "Generate" column.

This is the recommended non-destructive method to give thickness to a flat plane. : Click on your plane in Object Mode. 124793

: In Edit Mode, hold Alt and click an edge of the open boundary. : Go to the Modifier Properties tab (wrench

In the context of 3D modeling with , a "solid post" (or a solid object from a plane) can be drafted using the following primary methods: 1. Using the Solidify Modifier : In Edit Mode, hold Alt and click

: Press F to create a new face, sealing the volume to make it "manifold" (water-tight).

: By default, extrusion follows the normal of the plane (typically the Z-axis for a ground plane). 3. Filling a Hollow Shell

The identifier refers to a specific technical question on the Blender Stack Exchange regarding how to convert an extruded plane into a solid object.