You need 20-50% more filament than your 3D model's weight (plus supports)

A 3D print requires 1.2-1.5x the weight of your final model in filament, accounting for rafts, supports, and potential failed prints. For example, a 100g model may need 120-150g of filament. Always check your slicer's estimated usage before printing, as infill density and wall thickness dramatically impact consumption.

Key Factors Affecting Filament Usage

• Infill density: 10% infill uses far less than 100% (solid).
• Wall thickness: Thicker walls (e.g., 3+ perimeters) increase material use.
• Supports: Complex overhangs may add 30-100% extra filament.
• Model size: Scaling up linearly increases volume cubically (2x size = 8x filament).
• Layer height: Thinner layers (e.g., 0.1mm vs. 0.2mm) slightly increase usage.

Filament Needed for Common Print Sizes

How to Calculate Filament Needed

1. Use your slicer: Cura, PrusaSlicer, or others provide exact estimates after uploading the model.
2. Manual formula:
   • Volume (cm³) = Length × Width × Height (for simple shapes).
   • Filament weight (g) = Volume × Material density (e.g., PLA: ~1.24g/cm³).
   • Add 20-50% for supports/infill.
3. Weigh a test print: Print a small section, measure filament used, then scale up.

Tips to Reduce Filament Waste

• Optimize orientation to minimize supports.
• Use gyroid or grid infill (stronger with less material than rectangular).
• Enable "spiralize outer contour" (vase mode) for hollow prints.
• Lower top/bottom layers (e.g., 3 instead of 5) where strength isn't critical.
• Reuse failed prints by grinding into new filament (requires a filament extruder).

Filament Density by Material (g/cm³)