The Anatomy of a 3D Print
Whether you are looking to prototype a mechanical part or order a custom tabletop miniature, seeing a finished 3D print for the first time can feel like magic. But behind that "magic" is a series of technical decisions that determine how strong, smooth, and expensive your item will be.
At 3D & Crafts, we want you to feel confident in your order. To help you navigate the world of 3D manufacturing, here is a breakdown of the "anatomy" of a 3D print and how these settings affect your final product.
1. Layer Height: The "Resolution" of Your Print
3D printing works by laying down material one thin layer at a time. Layer height is the thickness of each of these layers.
- Fine Detail (0.08mm – 0.12mm): The layers are nearly invisible to the naked eye. This is perfect for display pieces or intricate jewelry.
- Standard (0.20mm): The "sweet spot" for most functional items. It offers a great balance of strength and visual appeal.
- Draft (0.28mm+): Visible "layer lines" but much faster to produce. Great for large, structural parts where looks don't matter as much.
The Trade-off: Smaller layers mean a smoother surface, but they significantly increase the time it takes to print, which can increase the cost.
2. Infill: The "Bones" Inside
Most 3D prints aren't solid plastic. To save weight and cost, the inside is filled with a repeating geometric pattern called Infill.
- Infill Percentage: This ranges from 0% (hollow) to 100% (solid). Most decorative items use 10–15%, while functional tools might use 40% or higher.
- Infill Pattern: Patterns like Gyroid or Grid provide strength in different directions.
The Trade-off: Higher infill makes a part heavier and much stronger, but it uses more material and takes longer to print.
3. Shells (Perimeters): The Outer Wall
While infill is the "bones," Shells are the "skin." This refers to the number of solid plastic outlines the printer draws before starting the infill.
- More Shells = More Strength: Surprisingly, adding an extra shell often makes a part stronger than increasing the infill. For high-stress parts, we typically increase the wall count to ensure the item won't crack under pressure.
4. Supports: The Temporary Scaffolding
3D printers cannot "print on thin air." If a design has an overhang (like the outstretched arm of a statue), the printer needs to build a temporary structure to hold that plastic up until it cools.
- Post-Processing: Once the print is finished, we manually remove these supports.
- Surface Finish: The area where a support touched the print may have a slightly rougher texture than the rest of the model.
The Trade-off: Complex designs with lots of overhangs require more material for supports and more labor-intensive "cleanup" time, which is reflected in the final price.