A simple Blender addon to move mesh data center to the bottom. The addon adds to Blender 2 operators:
Moves the mesh origin to the bottom center of surrounding volume.
Moves the mesh origin to the center of bottom vertices.
You need at least one mesh selected.
You can use it in three ways:
1. Open the functions search popup (usually with F3 key unless you changed the shortcut) and search for: origin to then select the operator you want to use.
2. Open the sidebar in the 3D View and Origin Tools tab.
3. Have a look in the 3D View menu: Object > Origin to Base