Prepping Your 3D Model for 3D Printing: A Guide to Success

Brad Harbert
Jan 10
3 min read

So, you've got a brilliant idea, you've designed an awesome 3D model, and you're ready to bring it to life with 3D printing. Hold on just a second! Before you hit "print," there are some crucial steps to ensure your model translates flawlessly from the digital world to a physical object. At Outlaw Prototyping, we want to help you achieve the best possible results, so we've compiled this comprehensive guide to preparing your 3D model for printing.

Creating an STL file in a CAD system to prepare for 3D Printing.

1. Design with 3D Printing in Mind

While it may seem obvious, designing with 3D printing in mind from the start can save you a lot of trouble later. Here are some key considerations:

Wall Thickness: Thin walls can be fragile and prone to breaking during printing. Ensure your model has sufficient wall thickness for the chosen material and intended use.
Overhangs and Supports: Overhanging features often require support structures during printing. Minimize these to reduce post-processing and material waste. Design with gradual slopes or consider alternative orientations.
Fine Details: Extremely fine details might be lost or distorted during printing. Strike a balance between intricate design and printability.
Moving Parts: If your design includes moving parts, ensure adequate clearance for assembly and movement after printing. Always run an interference analysis before printing just to ensure parts will fit together properly.

2. Choose the Right Software

There's a wide array of 3D modeling software available, each with its own strengths and weaknesses. Select a program that suits your design needs and provides the necessary tools for 3D printing preparation. Some popular options include:

Tinkercad: A beginner-friendly, browser-based tool ideal for simple designs.
Fusion 360: A powerful and versatile cloud-based CAD/CAM software suitable for both hobbyists and professionals.
Solidworks: Industry-standard CAD software used for complex designs and engineering applications.

3. Model Optimization

Once you've completed your design, it's time to optimize the model for printing. This involves:

Checking for Errors: Use your software's built-in tools to identify and fix any errors in the model, such as gaps, holes, or intersecting faces.
Removing Unnecessary Geometry: Delete any hidden or internal geometry that won't be visible in the final print. This reduces file size and printing time.
Simplifying Complex Shapes: If your model has overly complex shapes, consider simplifying them to improve printability.
Scaling and Orientation: Adjust the model's size and orientation on the print bed to optimize printing efficiency and minimize support structures.

4. Exporting the File

Most 3D printers use the STL (Stereolithography) file format. When exporting your model, choose the appropriate settings to ensure a high-quality STL file:

Resolution: A higher resolution results in a more accurate representation of the model but increases file size.
Units: Ensure the units are consistent with your 3D printer's settings.
File Repair: Some software offers options to repair common STL errors during export.

5. Slicing and Printing

Finally, use slicing software (like Cura or PrusaSlicer) to generate the G-code instructions for your 3D printer. The slicer will:

Generate Support Structures: If needed, the slicer will create support structures for overhanging features.
Slice the Model: The slicer divides the model into thin layers that the printer will build upon.
Set Print Parameters: You can adjust print settings such as layer height, infill density, and print speed.

Partner with the Pros

Feeling overwhelmed? No worries! At Outlaw Prototyping, we handle all aspects of the 3D printing process, from design and model preparation to printing and finishing. Our expert team can guide you through every step, ensuring your project is a success.