Beginners can hollow a 3D model with wall thickness by duplicating the model, scaling the copy inward, and using a tool (like Blender’s Solidify modifier or Tinkercad’s Hole) to create a shell.
Start with your model in software, duplicate it to keep the outer shape intact. Scale the copy smaller (5-10% is typical) to set wall thickness—this becomes the inner surface.
Use software tools: In Blender, add the Solidify modifier (adjust “Thickness” for uniform walls). In Tinkercad, mark the scaled copy as a “Hole” and group it with the original to cut the interior.
For new users, start simple: Try Blender’s Solidify first (no manual cutting) or practice with basic shapes in Tinkercad before tackling complex models.