Jewelry Manufacturing Guide

From STL File to Finished Jewelry Piece

This guide explains the typical workflow used in modern jewelry production, showing how a digital STL file becomes a finished physical jewelry piece.

1. Preparing the STL File

The process begins with a 3D design file (usually STL format) created in CAD software.

Common Jewelry CAD Software

  • Rhinoceros 3D
  • MatrixGold
  • ZBrush
  • Blender

Preparation Steps

  • Import the STL file into your CAD software.
  • Check dimensions and scaling (usually in millimeters).
  • Verify that the model is watertight (closed mesh).
  • Inspect for non-manifold edges or mesh errors.
  • Repair the mesh if needed.

This ensures the model is ready for manufacturing.

2. 3D Printing the Model

After the file is verified, it is sent to a 3D printer to create a physical prototype or casting model.

Common Printing Technologies

  • Resin SLA/DLP Printing – high detail, commonly used for jewelry.
  • Wax 3D Printing – used directly for casting.

Typical Jewelry Printers

  • Formlabs Form 3
  • Anycubic Photon Mono X

Process

  1. Import STL into slicing software.
  2. Add supports if necessary.
  3. Print the model in castable resin or wax.
  4. Clean and cure the printed model.

3. Investment Casting (Lost Wax Process)

Most jewelry pieces are produced using lost wax casting.

Steps

  1. Attach the printed model to a wax tree (sprue system).
  2. Place the tree inside a casting flask.
  3. Pour investment plaster around the models.
  4. Heat the flask in a kiln to burn out the wax/resin, leaving a cavity.
  5. Melt the metal (gold, silver, platinum).
  6. Pour or vacuum-cast the metal into the mold.

After cooling, the investment mold is broken to reveal the metal pieces.

4. Cleaning and Cutting

Once casting is complete:

  • Remove the jewelry pieces from the casting tree.
  • Cut off the sprues.
  • Clean off remaining investment material.
  • Inspect the metal piece for defects.

5. Finishing and Polishing

The raw cast piece undergoes several finishing steps.

Finishing Process

  • Filing and sanding rough surfaces
  • Polishing with polishing wheels
  • Ultrasonic cleaning
  • Surface finishing (matte, mirror, satin)

These steps refine the jewelry into a professional-quality piece.

6. Stone Setting (If Applicable)

If the design includes gemstones:

  • Stones are placed into the prepared settings.
  • Techniques such as prong setting, bezel setting, or pavé setting are used.
  • The piece is checked for secure stone placement.

7. Final Inspection

Before the jewelry is sold or delivered:

  • Check dimensions and symmetry
  • Inspect polish quality
  • Verify stone security
  • Perform final cleaning

The jewelry piece is now ready for packaging and sale.

✅ Summary Workflow

STL File → CAD Check → 3D Printing → Investment Casting → Cleaning → Polishing → Stone Setting → Finished Jewelry