To cut a 3D model without SketchUp, use free tools like Blender, Tinkercad, or Fusion 360—they support Boolean subtraction or dedicated cutting features. Basic workflow: Create/import a cutting shape (e.g., cube, plane), position it on your model, then apply a "subtract" or "hole" tool to remove the unwanted part. Tool specifics: Blender uses the Boolean Modifier to subtract a cutter; Tinkercad’s "Hole" tool turns a shape into a cutter—great for beginners. Common uses: Prepping STL files for 3D printing (Blender/Meshmixer) or simple DIY projects (Tinkercad). For new users, start with Tinkercad—it’s intuitive: Import your model, add a shape as a "Hole," align it, and cut in minutes.
