Technologies and Tools, Including Digital Design and Production
From file to physical object
Digital design tools include CAD for modelling and drafting, parametric modelling where dimensions drive geometry, simulation such as finite element analysis, and rendering for visualisation. Digital production includes additive manufacturing (FDM, SLA, SLS), subtractive CNC routing, milling and laser cutting, and digital fabrication aids such as vinyl cutting and printed electronics.
Understand the workflow: concept sketch, CAD model, export to a suitable file format (STL for mesh-based printing, DXF or SVG for 2D cutting), slicing or toolpath generation, machine setup, production, post-processing. Each stage has constraints: minimum wall thickness, overhang angles needing support, kerf width in laser cutting, tool diameter limiting internal corners, and material shrinkage.
Traps
- Assuming 3D printing is always best; it is slow per unit and weak across layer lines.
- Forgetting kerf compensation in laser-cut press-fit joints.
- Ignoring that CNC cannot cut a sharp internal corner smaller than the cutter radius.
- Overstating simulation: results depend on assumed loads and boundary conditions.
Rule of thumb
Match the technology to geometry, material, quantity and required tolerance. Prototype with additive, produce volume with moulding or CNC where appropriate.
Worked example: A press-fit laser-cut box. Design the slot width as material thickness minus kerf, then test-fit a sample. If the joint is loose, reduce slot width; if tight or charred, adjust power and speed. Document the tested parameter set so the design is reproducible.