Blender 3d printing toolbox add-on (free)

Blender 3d print toolbox addon

The 3D Print Toolbox is a popular and free addon for Blender that provides a variety of utilities specifically designed for 3D printing. Here are some of its key features:

Analyze: Calculate mesh volume and surface area, and check for bad geometry.

Edit: Create consistent thickness for complex shapes with the Hollow tool, and rotate models to align with the print bed.

Scaling tools: Fit your model to specific boundaries or volume.

Export: Quickly export selections to STL, PLY, and OBJ formats.

You can download it from here: https://extensions.blender.org/add-ons/print3d-toolbox/