Digital Fabrication
From the screen to matter — CNC, laser cutting and 3D printing.
Digital fabrication is where the parametric model becomes a physical thing — the machine reads the digital geometry directly and makes it. This unit covers the two families: subtractive manufacturing (remove material — CNC milling/cutting, laser cutting) and additive manufacturing (build up material layer by layer — 3D printing by FDM and SLS). It covers what each machine does, its materials, and how a parametric design is prepared for it. Fabrication closes the loop of this whole course: the rules generate the geometry, and the machine turns it into matter.
Learning objectives
By the end of this unit, you will be able to — mapped to the course outcomes for Parametric Architecture & Modelling:
Distinguish additive and subtractive digital-fabrication processes.
Describe CNC milling/cutting, laser cutting and 3D printing (FDM, SLS) and their materials.
Prepare a parametric design for fabrication (file-to-factory).
Explain how fabrication closes the loop from digital rule to physical artefact.
The two families
A machine makes the object directly from digital geometry; subtractive removes material (CNC, laser), additive builds it up (3D printing FDM/SLS).[7]
The machine reads the model
DIGITAL FABRICATION means a computer-controlled machine reads the digital GEOMETRY directly and makes the object — 'file to factory'. The parametric model (or its panelised/sliced output) becomes machine instructions (toolpaths, G-code, cut files). This removes the gap between design and making: complex, non-repeating geometry that would be impossibly costly to draw and build by hand becomes feasible, because the machine does not care whether every part is identical or unique.[7]
Pick a fabrication method
Choose a digital-fabrication method and read whether it is additive or subtractive, how it works, its materials, and what it is best for.
Digital fabrication · pick a method
Laser cutting
SubtractiveHow: A focused laser beam cuts or engraves flat sheet precisely and cleanly.
Materials: Card, acrylic, ply, leather, thin metals.
Best for: Architectural models, screens, jaalis and intricate flat profiles.
Subtractive removes material; additive builds it up layer by layer. Choose by material, scale and form.
From model to matter
A parametric design must be prepared for fabrication (panelise, develop, nest, export); designing for it means knowing the material and machine — and this closes the course's loop from rule to matter.[7, 8]
Geometry → instructions
A parametric design must be PREPARED for fabrication: panelise a surface into makeable parts (Unit II/III), unroll/develop curved panels to flat sheet where possible, add joints, tabs and tolerances, nest parts efficiently on the sheet to save material, and export the machine file (cut paths or a sliced/STL mesh for printing). 'Clean geometry in' is everything — a flawed model makes a flawed (or failed) part. The parametric definition can automate much of this preparation.[7]
At a glance
| Aspect | One | The other |
|---|---|---|
| Two families | Subtractive: remove material | Additive: build up layers |
| Waste & geometry | Subtractive: wasteful, tool-access limited | Additive: low waste, almost any form |
| Laser vs CNC mill | Laser: flat sheet, clean profiles | CNC mill: 3-D carving of a block |
| FDM vs SLS | FDM: cheap filament, needs supports | SLS: powder, strong, support-free |
| Designing for it | Just model the form | Respect material, kerf, tool access, joints |
Key terms
A computer-controlled machine making an object directly from digital geometry ('file to factory').
Manufacturing by removing material from a block/sheet — milling, cutting, laser.
Manufacturing by building material up layer by layer — 3D printing.
A rotating cutter carving a solid block in multiple axes.
A focused beam cutting/engraving flat sheet — the model-maker's workhorse.
Fused Deposition Modelling — 3D printing by extruding molten thermoplastic filament.
Selective Laser Sintering — 3D printing by fusing powder with a laser; no supports needed.
The width of material a cutting tool/laser removes — a tolerance to design for.
Studio task — the capstone
Take your parametric screen or shell from the earlier units and plan its fabrication: which method (use the explorer) for the study model and which for the 1:1 panels, how you would panelise/develop it for the machine, the material and its constraints (kerf, thickness, support), and how you would nest the parts. Then write one sentence on how the rule → geometry → tools → behaviour → matter chain held together across the whole course.
Self-assessment
1. 3D printing (FDM, SLS) is an example of which manufacturing family?
2. Laser cutting is mainly used in architecture for —
3. An advantage of SLS over FDM 3D printing is that SLS —
Recap
References & further reading
- [7]Iwamoto, Lisa — Digital Fabrications: Architectural and Material Techniques (Princeton Architectural Press, 2009); Canepa, Luca — Digital Fabrication in Architecture, Engineering and Construction.
- [8]Beorkrem, Christopher — Material Strategies in Digital Fabrication (Routledge).
Further reading
- Lisa Iwamoto — Digital Fabrications (2009).
- Luca Canepa — Digital Fabrication in Architecture, Engineering and Construction.
- Christopher Beorkrem — Material Strategies in Digital Fabrication.
Sources gathered and fact-checked June 2026. Published values vary by source, sample and method — treat as indicative and confirm against the cited standard before structural use.