Photocentric's JENI Aims to Replace Injection Molding With Fully Automated 3D Printing

The Machine That Does Not Look Like a 3D Printer

Photocentric's JENI looks more like server infrastructure than a 3D printer. It is a tower, lit from within by a deep red glow, built from modular sections that stack and reconfigure like rack-mounted hardware. Add a module and it grows. Reconfigure a node and it takes on a new process. A single installation can produce hundreds of thousands of parts a day. In some configurations, that number tops a million.

The UK company launched JENI as an autonomous production platform that pairs high-resolution LCD 3D printing with robotic post-processing. The goal is to manufacture plastic parts at volumes and costs that compete directly with injection molding. Photocentric calls it "injection molding without tooling."

Automating Away the Labor Cost

Additive manufacturing has always excelled at prototypes and complex one-offs. It has struggled with the parts the world runs on: clips, caps, connectors, grommets. Photocentric argues the problem was never the printing itself. It was labor, part handling, batch inconsistencies, and resin cost.

JENI is designed to run continuously and unattended. A digital file sent to the system carries both print instructions and the full post-processing sequence. JENI monitors every node, assigns the job to the next free one that matches its requirements, and a gantry moves the print platform into position. Because every job carries its own process parameters, two parts running in the same system at the same time can use different layer thicknesses and post-process cycles.

A single module can produce 238,000 standoff spacers per day at a cost of less than two cents each. Cable grommets cost about seven cents a piece on JENI, compared to thirty-four cents when bought externally. Material becomes the primary expense. Users can print with Photocentric's own photopolymers or any off-the-shelf 405nm resin.

The "Boring Parts" Argument

Photocentric's existing customers already use resin printing for dental models, footwear, jewelry, and miniatures. JENI targets what the company calls "the boring parts": housings, mounts, brackets, connectors, manifolds, clips, handles, knobs. Producing these in-house is fast and cost effective. There is no need for tooling, no minimum order, and no waiting for a mold to be cut.

The platform also removes design constraints common to injection molding. There are no draft angles, split lines, or ejector pin marks to design around. Undercuts and internal geometry cost no more to produce than simple shapes of the same volume. Surface texture, fine grain, and decorative finishes are free to include. In injection molding, those features must be cut into the tool at considerable expense and then fixed for the tool's lifetime.

Sustainability Claims and Bio-Based Resins

Photocentric formulates its own photopolymers, and a growing share of the monomers and oligomers come from low-value bio-waste, food waste, and agricultural residues rather than petrochemicals. Its Durable DL902 Plant-Based resin, for example, uses 52% bio-based raw material. After curing, it reaches an ultimate tensile strength of 46 MPa and 37% elongation before failure.

The company claims an 85% carbon savings compared to traditional manufacturing. That figure rests on three factors: the bio-based material content, the efficiency of continuous lights-out production, and the fact that parts do not require steel tooling, which has a large embodied carbon cost upfront.

Origins in a Pandemic Print Farm

JENI traces back to a specific moment during the Covid-19 pandemic. Photocentric ran a farm of 52 LC Magna printers that, at one stage, produced more than a million face shields a month. That experience exposed the operational pain points that became JENI's design brief: part handling, batch inconsistencies, and the sheer amount of labor required to run a large resin farm manually.

Paul Holt, Managing Director of Photocentric, put it plainly: "Over the last six years the mission for Photocentric, and me personally, has been to enable digital mass manufacturing as an ubiquitous alternative to injection molding. We called this project JENI, after the first machine of the first industrial revolution, the Spinning Jenny. JENI brings the concept of digital file in, digitally made part out, to reality."

The Catch

JENI's build envelope is limited by its 10-inch screen: 224 x 127 x 57 mm. Photocentric focused on that size because parts produced in the millions tend to be small. A platform of parts completes roughly every 20 seconds. An unattended overnight shift can fill a small warehouse if the downstream packing and sorting line keeps pace. For larger parts, traditional injection molding still wins on cost and cycle time.

The first adopters will likely be innovation teams inside large companies that currently rely on injection molding, plus Photocentric's existing customer base in dental and footwear. An open materials platform means a single installation can run a different resin on each node, mixing dental models, orthodontic trays, and consumer parts in the same batch.

JENI does not make injection molding obsolete. It does offer a path to produce certain small parts without the upfront cost and lead time of tooling, especially when volumes are uncertain or designs are still changing. For manufacturers sitting on the fence between additive and traditional processes, that is a meaningful option.