Most people's image of 3D printing is a spool of single-color plastic filament being extruded by a desktop machine. The result is a monochrome object, usually in PLA or ABS, that looks unmistakably like a 3D print. It's useful for prototyping brackets, phone cases, and replacement parts. Color 3D printing is a different world entirely.
Color 3D printing produces objects with color built into them during the print itself, layer by layer, pixel by pixel. A single print run can produce thousands of distinct colors across a surface, reproducing photographic textures, gradients, and fine detail that would take a painter hours to replicate by hand.
The technology has existed since the late 1990s, but it remains surprisingly obscure. Most people have never seen a full-color 3D print in person. When they do, the reaction is almost always surprise. The objects don't look like what they expect from a 3D printer. They look like digital objects that have popped into material existence.
How It Works
There are several approaches to color 3D printing, but they all share a basic principle: depositing color information simultaneously with structural material, so that the object emerges from the machine already colored.
Multi Jet Fusion (HP Color Nylon)
HP's Multi Jet Fusion process fuses nylon powder (PA12) using infrared energy, with color agents applied during the fusing process. The results are engineering-grade nylon parts with full color, functional enough for end-use applications while carrying photographic surface detail. The surface has a slightly rough, matte texture characteristic of sintered nylon, and the colors tend to be more muted and earthy than other color technologies.
This is the technology we use at Amema for the majority of our jewelry. The nylon is durable enough to wear daily, and the matte, slightly textured surface gives the charms a quality that reads as handmade rather than manufactured.
Binder Jetting (Gypsum / Sandstone)
The original color 3D printing technology, developed at MIT in the 1990s and commercialized by Z Corporation. A thin layer of gypsum powder is spread across a build platform. An inkjet printhead passes over the powder and deposits a liquid binding agent infused with CMYK ink. The binder glues the powder together and colors it at the same time. Another layer of powder is spread, and the process repeats.
The result is an object made of hardened gypsum plaster with color baked into its surface. After printing, the object is excavated from a bed of loose powder (the surrounding unbound powder acts as its own support structure), then infiltrated with superglue or epoxy to harden it.
The finish is matte, granular, and warm to the touch. We use this technology at Amema for select archive pieces and occasional special editions. The material has a quality that no other 3D printing process can reproduce, but the machines are reaching end of life and the technology is disappearing (more on this in a future post).
UV-Curable Resin (Mimaki, Stratasys PolyJet)
Newer systems from Mimaki and Stratasys jet tiny droplets of UV-curable photopolymer resin that are immediately hardened by ultraviolet light. These systems can produce over 10 million colors and achieve extremely fine detail. The surface finish is smooth and hard. These machines produce stunning results, especially for figurines and display pieces. The trade-off is that the objects look and feel distinctly plastic: glossy, sealed, synthetic.
Why Color Matters
Color makes 3D prints look better, but more importantly, color changes what 3D printing can be used for.
Without color, a 3D print communicates geometry: dimensions, proportions, topology. With color, a 3D print communicates texture, pattern, wear, age, identity. That jump from geometry to surface is the jump from engineering to aesthetics, from prototype to object.
This is why color 3D printing has found its strongest foothold in architecture, art, figurines, and jewelry. These are fields where the surface of an object carries as much meaning as its structure. An architectural model needs to show the materiality of a facade, not just the massing of the building. A piece of jewelry needs to look like something you'd actually want to wear.
Color also enables the reproduction of existing objects. When you 3D scan something real (a vintage toy, an archaeological fragment, a piece of coral) you capture both shape and surface appearance. Color 3D printing is the only technology that can reproduce both in a single output. The scan goes in; a physical replica comes out, looking uncannily close to the original.
The Texture Question
Among the different color 3D printing technologies, the most interesting divide is texture.
Resin-based prints (Mimaki, PolyJet) produce surfaces that are smooth, glossy, and sealed. They look polished and professional. They also look obviously manufactured. You pick one up and your brain immediately categorizes it: plastic thing.
Gypsum prints have a porous, matte, and slightly rough surface. The material absorbs light instead of reflecting it. There's a warmth and weight to it that confuses your expectations.
HP MJF color nylon sits in between. The surface is matte and slightly textured, with a powdery quality. The colors are earthier and more muted than resin, but the material is far more durable than gypsum. For wearable objects, this balance of texture and strength makes it the most practical choice.
At Amema, we work primarily with HP MJF for our production charms because the nylon holds up to daily wear while still producing the matte, textured surface we want. For archive pieces and limited editions, we use gypsum, which has a material presence that nothing else can match.
Where Color 3D Printing Is Going
The original gypsum-based systems are being discontinued. The newer resin and nylon systems are more capable, more durable, and easier to maintain. For large-scale applications, the trajectory is clearly toward resin and nylon.
But gypsum printing produced a genuinely unique category of object, something that sat between ceramic, stone, and digital fabrication. As it disappears, that category of object goes with it. The things that were made with it become a little more rare, a little more specific to a moment in time.
Which is exactly how objects accrue the kind of value that makes them worth keeping.
Amema uses HP Multi Jet Fusion color 3D printing for the majority of our jewelry, with select archive and special edition pieces produced in full-color gypsum. Each charm is printed from 3D scans of vintage objects, carrying photographic texture in a cute wearable form.