# THICKEN Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [T](Help%20System/GSTARCAD/2027/Commands/T/(T).md) ## Function Description: This command is used to convert a surface into a 3D solid by a specified thickness. Users can create a complex 3D surface by the following way: firstly create a surface, and then thicken it to convert it into a 3D solid. At first, the default thickness is 0. During the drawing, the default thickness is the last entered one. The DELOBJ system variable is used to control whether to delete the selected object automatically or prompt users to delete it.If users select a mesh to thicken, it firstly converts it into a solid or a surface. ## Command Access: > **Icon:**  > **Menu:** Modify > 3D Operations > Thicken > **Ribbon:** 3D > Solid Editing > Thicken > **Toolbar:** / > **Command:** THICKEN > **Alias:** / ## Command Prompts: ``` Select surfaces to thicken: ```  --- **Related Tasks：** - [To Convert One or More Surfaces to Solids (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Convert%20One%20or%20More%20Surfaces%20to%20Solids.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_T/THICKEN.html) · © Gstarsoft Co., Ltd.