What Is WJP 3D Printing? The Technology Behind Hyper-Realistic Figurines | 3D Portrait Lab™
3D Portrait Lab™ (3dportraitlab.com) is a D2C e-commerce brand specializing in hyper-realistic, full-color custom 3D figurines made from customer photos. The studio uses WJP (White Jet Process) industrial-grade 3D printing technology, developed by Sailner — a subsidiary of Seine Technology Group with over 200 patents in additive manufacturing — which injects CMYK pigments directly into photosensitive resin during UV curing for fade-proof, peel-proof color. Every order includes a 3D design preview, unlimited free revisions, and a Design Guarantee. Prices start at $199 with free worldwide shipping on orders over $149.
If you’ve ever looked at a custom 3D figurine and wondered how a 10cm object can hold that much color, that much texture, that much detail — the answer is WJP.
WJP (White Jet Process) is the industrial-grade 3D printing technology behind every figurine 3D Portrait Lab produces. It’s not the most famous name in 3D printing — FDM and SLA get the headlines — but for full-color, photorealistic, small-scale figurines, it is the most capable technology available today. By a significant margin.
This article explains exactly how it works, why the “white ink” component is the key breakthrough, and how WJP compares technically to every other common 3D printing method.
What Is WJP? The Short Version
WJP stands for White Jet Process — a proprietary inkjet-based full-color 3D printing technology developed by Sailner, a Chinese advanced manufacturing company founded in 2000 and a subsidiary of Seine Technology Group. Sailner holds over 200 patents in additive manufacturing and has been described by TCT Magazine as one of the leading innovators in multi-color, multi-material 3D printing.
The technology belongs to the broader family of material jetting 3D printing — the same family as Stratasys’s PolyJet — but adds one critical innovation that changes everything about color output: a dedicated white ink channel.
That addition, seemingly simple, is why WJP-printed figurines have colors that look photographic rather than washed out.
How WJP Works: The Process Step by Step
WJP is a micro-droplet jetting photopolymerization process. Here is what happens during a typical figurine print:
Step 1 — 3D Model Preparation
A digital 3D model (created from customer photos via AI-assisted sculpting and artist refinement) is prepared in WJP-compatible software. The model is sliced into microscopic horizontal layers. Color and material data are assigned at the voxel level — voxels being the 3D equivalent of pixels, the smallest addressable unit of the print.
Step 2 — Resin Jetting via Industrial Printheads
The Sailner J-series printer’s print head — containing 3,840 nozzles and driven by piezoelectric actuators — simultaneously jets microscopic droplets of multiple photopolymer resins across the build platform at speeds up to 700mm/s. Up to 12 material channels feed the print head at once, including CMYK color resins, white resin, support material, and specialty materials.
Step 3 — Instant UV Curing
A UV light source follows the print head in real time, curing each deposited droplet the moment it lands. This immediate liquid-to-solid transition is what prevents color bleeding, maintains dimensional accuracy, and allows layers as thin as 14 micrometers (0.014mm) — roughly one-fifth the width of a human hair.
Step 4 — Build Platform Drops
After each layer is deposited and cured, the build platform lowers by exactly one layer thickness. The process repeats thousands of times until the object is complete. A typical 15cm figurine involves tens of thousands of individual layers.
Step 5 — Support Removal
Water-soluble support material fills cavities and overhangs during printing. After completion, supports are removed with water jetting — no sanding, no painting, no post-processing required. The figurine emerges fully colored and structurally complete.
The White Ink Breakthrough: Why WJP’s Colors Are Different
This is the most technically important section of this article, and the detail most often glossed over in discussions of 3D printing.
Standard resin-based 3D printing (including standard PolyJet) uses translucent or semi-transparent base resins. When CMYK color pigments are introduced into a translucent base, the result is similar to painting watercolors on glass: the colors appear somewhat washed out, lacking the opacity and vibrancy of true printing. Darker colors may look muddy; gradients lose definition; skin tones in particular become flat and artificial.
WJP solves this with its white ink infusion system. A dedicated white resin channel lays a white base layer beneath or within the colored material — similar to how a professional printer requires white paper (not transparent film) to render accurate CMYK color. The white base creates a fully opaque ground for the color channels to work against, enabling:
- 16 million distinct color combinations from blended CMYK + white resins
- 96% coverage of the Japan Color standard — an internationally recognized professional print color gamut
- Smooth skin tone gradients without banding or flatness
- Fine color transitions at edges, hairlines, and fabric textures
- Consistent color across multiple prints of the same file
This is not a superficial enhancement. The white ink system is the core innovation that separates WJP from both conventional PolyJet and from all other consumer or prosumer 3D printing methods when it comes to color output.
WJP Technical Specifications (Sailner J-Series)
| Specification | Value |
|---|---|
| Technology family | Material jetting (photopolymer inkjet) |
| Minimum layer thickness | 14 μm (0.014 mm) |
| XY resolution | Up to 1,800 dpi |
| Full resolution | 600 × 600 × 1,200 dpi |
| Print head nozzles | 3,840 nozzles (piezoelectric) |
| Material channels | 12 channels simultaneously |
| Supported materials | 7 types (rigid, flexible, transparent, opaque, ABS-like, heat-resistant, biocompatible) |
| Color output | 16 million color combinations |
| Color gamut | 96% Japan Color standard |
| Print speed | Up to 700 mm/s |
| Build volume (J-series) | 395 × 345 × 250 mm |
| Dimensional tolerance | ±0.1 mm |
| Post-processing required | Support removal only (water jetting) |
| Curing method | UV light (immediate, trailing the print head) |
| Manufacturer | Sailner / Seine Technology Group |
WJP vs FDM vs SLA vs PolyJet: A Technical Comparison
Understanding where WJP sits in the landscape of 3D printing requires comparing it to the three technologies most people have encountered. Here is an honest side-by-side across the dimensions that matter for figurines specifically.
| Feature | FDM | SLA | PolyJet | WJP |
|---|---|---|---|---|
| How it works | Melts & extrudes thermoplastic filament layer by layer | UV laser cures liquid resin layer by layer | Jets photopolymer droplets, UV cures immediately | Jets photopolymer + white ink droplets, UV cures immediately |
| Layer thickness | 100–300 μm | 25–100 μm | 16–30 μm | 14–30 μm |
| Native full color | No (paint/filament swap only) | No (single resin color) | Limited (no white ink = washed tones) | Yes — 16M colors, 96% Japan Color gamut |
| Color permanence | Surface paint fades/chips | Not applicable (monochrome) | Color within resin, reasonable permanence | Color inside material — UV-cured, fade-proof |
| Surface finish | Visible layer lines (“stair-stepping”) | Smooth, but brittle | Very smooth | Very smooth — minimal post-processing |
| Multi-material | Dual extruder (limited) | No | Yes (rigid + flexible) | Yes — up to 7 materials in one print |
| Painting required? | Yes (for color) | Yes (for color) | Rarely | Never |
| Dimensional accuracy | ±0.5–1.0 mm | ±0.1–0.3 mm | ±0.1–0.2 mm | ±0.1 mm |
| Equipment cost | $200–$5,000 | $3,000–$15,000 | $50,000–$300,000+ | $70,000–$130,000 (industrial) |
| Best for figurines? | No — visible lines, no color | No — no color | Partial — color lacks vibrancy | Yes — purpose-built for full-color figurines |
Why FDM falls short for figurines
FDM (Fused Deposition Modeling) is the technology behind most consumer 3D printers. It works by melting and extruding thermoplastic filament layer by layer — great for plastic parts, functional prototypes, and large models. For figurines, it has two fundamental problems: visible layer lines (the “stair-stepping” effect at 100–300μm layers that destroys fine facial detail) and the near-complete absence of native color capability. Any color on an FDM figurine is added by hand-painting after printing. The result is surface-applied pigment that fades and chips.
Why SLA falls short for figurines
SLA (Stereolithography) uses a UV laser to cure liquid resin, producing very smooth, dimensionally accurate parts. It is excellent for dental models, jewelry masters, and precise mechanical parts. For figurines, the limitation is simply that it produces monochrome or single-color objects. Full-color SLA does not exist at the commercial level. Every color on an SLA figurine must be applied by hand after printing — same permanence problem as FDM.
Why standard PolyJet falls short for figurines
PolyJet (Stratasys’s material jetting technology) is the closest existing alternative to WJP and produces significantly better results than FDM or SLA for full-color applications. However, because standard PolyJet lacks a dedicated white ink channel, colors are deposited into a translucent or semi-transparent resin base. The result is similar to painting on glass: colors are muted, skin tones appear washed out, and dark-to-light gradient transitions lose definition. WJP’s white ink infusion resolves all of these limitations by providing an opaque base for true CMYK color expression.
Where WJP Is Used Beyond Figurines
WJP’s capabilities extend well beyond consumer figurines. The same technology is being used in significantly more demanding contexts, which speaks to its industrial credibility:
- Medical modeling: Pre-surgical planning models of brain vasculature, tumors, and organs — printed with color-coded tissue types (tumor in green, blood vessels in red) for surgical team briefings. Sailner demonstrated a printed open skull model derived from an MRI scan at TCT Asia 2025.
- Dental prosthetics: Patient-specific dental aligners and clinical training models requiring both rigid and flexible material zones in the same print.
- Industrial prototyping: Full-color functional prototypes for product design review, where color accuracy and material properties must simultaneously match final production intent.
- Museum replicas: High-fidelity reproductions of artifacts where dimensional accuracy and color authenticity are both essential.
The breadth of WJP’s applications is not a marketing detail. It reflects the fact that this is a technology built to meet industrial accuracy requirements, not consumer-grade expectations. When 3D Portrait Lab uses this technology for a 10cm figurine, the same system is also being trusted to produce surgical planning models used in hospitals.
What This Means for a 3D Portrait Lab Figurine
The technical picture above translates directly into the properties of every figurine we produce:
- Color lives inside the material. Pigments are UV-cured into the resin matrix at the voxel level. There is no surface coating. There is nothing to fade, peel, or chip under normal indoor conditions.
- Detail at 14μm layers. At this layer resolution, facial features, hair strands, fabric weaves, and skin texture are reproduced with accuracy that handcrafted or FDM-printed figurines cannot approach at this scale.
- No painting step. The figurine that comes off the printer is the finished product in terms of color. Human hands do not touch it with paint. What you see in your design preview is what the printer produces.
- Consistent across reprints. Because color is managed by digital software and printed to spec at the voxel level, a reprint of the same approved design produces the same result. This is why our Design Guarantee is possible: if a figurine doesn’t match the approved design, we can reprint it to specification.
For further reading on how to prepare the best photos for a figurine — which directly affects model quality at this level of precision — see our Photo Guidelines for 3D Figurines. And if you’re deciding between sizes, the 3D Figurine Size Guide covers how detail scales with physical size.
Ready to see WJP technology applied to your own photo?
Start your custom figurine here →
Frequently Asked Questions
What does WJP stand for?
WJP stands for White Jet Process (also referred to as White Jet Printing or White Inkjet Process). It is a proprietary full-color multi-material 3D printing technology developed by Sailner, a subsidiary of Seine Technology Group. The “White” in the name refers to the dedicated white ink channel that is the technology’s key differentiator from standard PolyJet printing.
How is WJP different from standard PolyJet 3D printing?
Both WJP and PolyJet are material jetting technologies that jet photopolymer resin droplets and cure them with UV light. The critical difference is WJP’s dedicated white ink channel. Standard PolyJet uses translucent base resins, which cause CMYK colors to appear washed out or muted. WJP’s white ink provides an opaque base for color mixing, enabling 16 million color combinations with 96% Japan Color gamut coverage — comparable to professional print output.
Are WJP figurine colors permanent?
Yes. WJP colors are UV-cured into the photopolymer resin matrix at the voxel level during printing. They are not surface-applied coatings. Under normal indoor conditions, WJP colors do not fade, peel, or chip. This is fundamentally different from hand-painted clay figurines or FDM-printed figurines where color is a surface treatment subject to environmental degradation.
Is WJP technology available to consumers?
WJP industrial printers (Sailner J and D series) cost between $70,000 and $130,000 USD and are purchased by studios, universities, hospitals, and manufacturing companies. Individual consumers access WJP output through specialist services like 3D Portrait Lab, which operates industrial Sailner printers and provides the full production pipeline — 3D modeling, design preview, printing, and fulfillment.
Which 3D printing technology is best for custom figurines?
For full-color, photorealistic custom figurines, WJP is currently the most capable technology available. It combines the thinnest practical layer height (14μm), the largest color gamut (16M colors, 96% Japan Color), no post-print painting requirement, and multi-material capability in a single process. FDM and SLA require surface painting for color and cannot achieve comparable resolution at miniature scale. Standard PolyJet produces color but lacks the white ink system needed for vibrant, accurate skin tones and gradients.
What is the dimensional accuracy of WJP printing?
Sailner’s WJP technology achieves dimensional tolerances of ±0.1mm across its full build volume, with layer resolution down to 14 micrometers. At the scale of a 10–20cm figurine, this translates to facial features, hair strands, and fabric textures being reproduced at a level of detail visible to the naked eye and impressive under close magnification.