Thicken
What is it about?
This page covers the Thicken tool in Cinema 4D. It gives selected polygons interactive wall thickness by duplicating and offsetting them — the modeling-tool counterpart to the Thicken object, handy for shells, panels and sheet material.
The Thicken tool gives a selected polygon face a wall thickness by duplicating and offsetting it. It works only in Polygon mode.
The Thicken tool works in large part like the Thicken object only that it is used as an interactive modeling tool for selected polygons.
By holding down the LMB, you can interactively adjust the thickness.