What is LFAM (Large Format Additive Manufacturing)?

LFAM is a subset of additive manufacturing (the technical term for 3D printing) defined by the size of the part it can produce in a single continuous run. Desktop 3D printers work in a few hundred millimeters. Industrial LFAM systems work in meters — typical print envelopes range from 2 x 2 x 2 meters to 12 x 6 x 6 meters, and multi-cell configurations can produce elements up to 40 meters long.

The threshold isn't formal, but in industry practice a system is considered LFAM when the print envelope exceeds roughly one cubic meter and the deposition rate is measured in kilograms per hour, not grams per hour.

The category also implies a change in materials. Where desktop printers extrude a thin strand of plastic, LFAM systems extrude a thick pellet-fed bead of polymer, fiber-reinforced composite, mineral composite or bio-composite. That bead is what allows the process to scale — it deposits material fast enough to make architectural-scale printing economically viable.

The economics of 3D printing change at scale. Below one cubic meter, desktop and mid-format systems compete with injection molding, CNC and casting. Above one cubic meter, LFAM competes with hand fabrication, GFRC casting and custom millwork — a very different economic frontier where geometry is the constraint, not tooling.

There are two dominant hardware architectures. Gantry systems mount an extruder on a large X-Y-Z overhead frame — the classic industrial 3D printer scaled up. Robotic systems mount the extruder on a 6-axis industrial robot arm, which allows non-planar toolpaths, printing on angled surfaces, and continuous layers that follow the geometry rather than slicing it into flat horizontal cuts.

Robotic LFAM is the architecture LoopForm operates. It trades some vertical build height for radical geometric freedom — the ability to print curved cantilevers, spatial lattices and continuous forms that a gantry cannot reach.

1. Design: geometry is authored in a CAD environment (Rhino, Grasshopper, Houdini or a solid modeler) and prepared as a printable mesh or surface.

2. Toolpath: the geometry is sliced or authored directly as a robot toolpath — a sequence of coordinated moves in X, Y, Z and, for robotic systems, in orientation.

3. Simulation: the toolpath is simulated against thermal, structural and reachability constraints before any material is extruded.

4. Print: the extruder deposits a heated bead of polymer or composite bead-by-bead, layer-by-layer, at rates typically between 5 and 50 kilograms per hour.

5. Finish and install: the printed element is trimmed, sanded, coated or left as-printed, then crated for site delivery and installation.

LFAM materials are pellet-fed rather than filament-fed. That change is what enables the deposition rate. Common families include recycled and virgin thermoplastics (PETG, ABS, PLA), fiber-reinforced thermoplastics (carbon and glass reinforced polymers for stiffness), mineral composites (cementitious systems for exterior and structural use), and bio-composites (cellulose, hemp, PLA blends for low-carbon builds).

Material choice is driven by application. Interior architecture typically uses recycled polymer for cost and finish; exterior architecture typically uses mineral composite for weathering; tooling typically uses fiber-reinforced polymer for stiffness and temperature resistance.

Architecture: full-scale walls, ceilings, columns, façade panels, screens and interior features.

Tooling: composite layup tools, thermoforming molds, concrete formwork, foundry patterns.

Furniture and objects: contract seating, tables, lighting, sculpture, limited editions.

Scenic and experiential: public art, exhibition architecture, themed rockwork, film and TV set architecture.

The unifying thread is geometry that traditional trades cannot economically produce — one-off, curved, or continuous forms where the setup cost of a mold, mill or hand-sculpt would exceed the value of the piece.

LFAM is not a replacement for concrete, steel or millwork — it complements them. Where a project needs a repeating rectilinear panel, conventional fabrication wins on unit cost. Where a project needs a one-of-one sculptural form, LFAM wins on setup cost and lead time. Most real projects use both: LFAM for the signature moments, traditional trades for the field.