From Plastic 3D-Printed Cavalier Ring to Real Gold Finish Using Simple Electroplating Basics

A small ring printed in ordinary PLA filament starts light and hollow then gains real metal weight once copper deposits across every surface. Hendrik of the HEN3DRIK channel demonstrates the full sequence on a cavalier-style signet model with raised letters, moving from raw print to polished copper and finally to a palladium barrier under genuine gold.

Surface prep chores remove the odd stepped appearance caused by fused deposit modeling, allowing for metal application. Scrape out each layer line with a razor blade, then sand to 800 grit to provide an even and smooth surface. Alternatively, you can use a filler primer, sand to level, and then seal everything with a two-part clear lacquer so that when you return to apply your conductive paint, the acetone does not penetrate the primer and damage it.

Conductivity is achieved using a very simple graphite mixture consisting of three parts 4-micron graphite powder, twenty parts acetone, and one part cyanoacrylate. Simply apply three thin coats with an airbrush and your multimeter should show a reading of less than 900 ohms between any two locations. Once the paint has dry and set, give it a brief shine to reduce resistance and increase adherence.

You need to keep safe throughout this process, so put on a lab coat, a respirator with organic-vapor cartridges, chemical-resistant gloves, and safety goggles, all while keeping some air moving so you do not suffocate or burn yourself. You’ll be utilizing a bright acidic copper solution in a container with a magnetic stirrer inside. Then, wrap a cleaned copper anode in coffee filters, then in a polypropylene bag, and hold it against the ring. This entire thing will be suspended from a copper wire attached to the negative lead of a constant-current DC source.

There is an online calculator called Scorzz that will take your STL and give you the precise amount of amperage to utilize. You’ll start with half that value for the first five minutes before increasing it to full current. After around 4 hours, your ring will look gorgeous and lustrous. One sample he observed grew from 1.4 to 4.6 grams as it developed a continuous copper shell.

Next, sand it with 1000-grit paper and polish it to a high gloss. Then, grab a pen plating setup and apply a few more coats. The pen touches a palladium solution while the ring is still negative, and you simply walk around in a steady circle to deposit a thin barrier. After a quick rinse and degrease, apply a thin layer of gold using the pen in the same manner.

Copper ions from the electrolyte reduce onto the surface of the conductive paint as the anode dissolves at a similar pace, ensuring that the electrolyte remains stable. Make sure to rinse it well between stages to avoid contamination or adhesion issues. Overall, final items have the weight and toughness of genuine metal, despite being created using only a power supply, a stirrer, and chemicals that most producers already have on hand. The same procedure may be used to create various little prints; all that is required is to first smooth down the surface.