Coloring 3D‑Printed Parts with Wax Crayons: A Novel Post‑Processing Technique

At RP Platform, we are dedicated to advancing additive manufacturing by developing more effective and efficient post‑processing solutions. Our focus is on techniques that deliver outstanding finishes while also being practical for production environments.

Recently, engineer Christian Reed introduced an eye‑catching method that uses wax crayons to add color to plastic prototypes. The process begins by sanding the part to a smooth finish. A heat gun then melts the crayons, allowing the liquid wax to seep into the model’s indented areas. Once the wax dries, the surface can be cleaned and smoothed, resulting in a polished, colorful design.

Although this approach was initially demonstrated for prototyping—and has already secured a Kickstarter launch—it opens exciting possibilities for broader applications. By incorporating the colored indents directly into the design stage, manufacturers can achieve multi‑colored, dimensionally precise components with minimal additional effort.

Automating this technique for mass production presents challenges, but it is well suited for high‑end, one‑off parts such as custom interior panels for sports cars. In such cases, more durable materials—silicone, gold, or silver—could replace wax to enhance longevity and finish quality.

We encourage innovators to share new finishing methods that elevate the aesthetic and functional value of 3D‑printed parts. Let’s continue pushing the boundaries of what’s possible in additive manufacturing.