Beginners scaling a 3D model with infill typically follow four steps: import the model into slicing software, use the scale tool to adjust dimensions, tweak infill density for the new size, and preview the sliced model to confirm.
Scaling changes strength needs—small decorative pieces need lower infill (10-15%) to save material, while large functional parts need higher infill (20-30%) to stay strong. Slicers like Cura make adjusting infill easy via the infill menu.
If unsure about infill after scaling, start with the slicer’s default (e.g., 15%)—it’s a safe baseline. Use the cross-section preview to check how infill fits the scaled model before printing.