Make

3D printing introduces additive manufacture -- building objects layer by layer rather than cutting from a block. Pupils learn 3D CAD modelling, understand the capabilities and limitations of FDM printing (layer resolution, support structures, infill percentage), and design products that exploit the unique advantages of additive manufacture (complex geometries impossible by subtractive methods). This is the most industry-relevant emerging technology in the KS3 DT curriculum.

A laser-cut clock is the ideal introduction to CAD/CAM because the product is flat (suitable for 2D cutting), requires precise geometry (the clock mechanism needs an exact hole), and has both functional and aesthetic dimensions. Pupils learn to use 2D design software, convert designs to machine-readable files, and operate a laser cutter. The project demonstrates that digital manufacturing produces results impossible by hand (intricate patterns, precise tolerances).

A night light that responds to ambient light levels (using an LDR sensor and microcontroller) is the simplest embedded computing project and the natural progression from KS2 simple circuits. Pupils learn that products can sense their environment and respond intelligently -- the core principle of embedded computing. Programming the microcontroller (Arduino or micro:bit) to read sensor input and control LED output teaches input-process-output in a physical context.

Automata (mechanical toys driven by cams, cranks, gears and linkages) build directly on KS2 cam mechanisms but with far greater mechanical complexity. Pupils combine multiple mechanisms in a single product: a crank converts rotation to reciprocation, a linkage amplifies or redirects motion, gears change speed and direction. The visible mechanism is part of the aesthetic -- automata celebrate engineering as art. This project integrates structures, mechanisms and resistant materials in a single outcome.

A phone or tablet stand is a small, achievable resistant materials project that introduces marking out, cutting, shaping and finishing in wood, metal or acrylic. The product has an immediate real-world use that motivates quality finishing. The design challenge -- holding a device at a comfortable viewing angle while being stable -- naturally introduces ergonomics and basic structural analysis. Pupils can apply CAD to generate a template before making.

An upcycling design challenge forces pupils to work within material constraints -- the available waste materials define the design possibilities. This teaches sustainable design thinking: considering the environmental impact of material choices, the lifecycle of products, and the concept of circular design. Pupils investigate real-world sustainability issues (plastic waste, fast fashion, planned obsolescence) and respond with a designed product that gives waste materials a new, functional life.

A drawstring bag introduces secondary textiles skills: using a sewing machine, working with multiple fabric layers, and applying surface decoration techniques (applique, fabric printing, embroidery). The design brief requires pupils to research a target user and create a product that meets specific functional and aesthetic requirements. This project builds directly on KS2 hand-sewing and introduces the precision and speed of machine-sewn construction.

Introduce CAM processes by connecting them to the design file: how does a 2D vector drawing become a laser-cut part? How does a 3D model become a 3D-printed component? Set making tasks that require pupils to select from a range of available processes, justifying their choice in terms of material, precision, speed and scale. Build in time for pupils to encounter and solve problems during making, developing their adaptive and iterative making skills. Teach quality control as an integral part of making: check, measure and test at each stage, not only at the end.

Pupils may assume that CAM processes always produce better results than hand making, not understanding that the quality of the output depends on the quality of the design file. They may also see CAM as 'cheating' rather than as a professional making skill. Some pupils may not understand why making problems require design modifications rather than just making harder; the iterative relationship between designing and making needs explicit modelling.

DT design process concept — structured design briefs and evaluation frameworks guide non-specialist adults.

Develop a materials selection matrix approach: list requirements on one axis, candidate materials on the other, score each material against each requirement, and select the material with the highest combined score. Investigate how composite materials combine properties from different constituent materials. Study materials data sheets and supplier catalogues as real-world selection tools. Set open material selection tasks where pupils must research, compare and justify their material choices for complex multi-material products. Connect material selection to sustainability: what is the environmental cost of different material choices?

Pupils may select familiar materials rather than the most appropriate ones. Systematic matrix-based selection challenges habitual choosing. The idea that different materials in a single product must be compatible with the same making processes can be missed; teaching pupils to consider how each part will be made alongside what it will be made from prevents this.

DT knowledge concept — material science, mechanisms theory, and systems knowledge deliverable digitally.