Design for manufacturing and assembly, before tooling locks the product in. We review parts, fits, fasteners and the build sequence so a prototype can be made again, by someone who was not in the room.
A part that prints is not a part that repeats.
DFM asks whether the process can make the part. DFA asks whether a person, or a line, can put the product together without special knowledge. We do both on the same design, with mechanical, electronics and the enclosure in one review.
Design for manufacturing
Process choice comes first: mould, sheet metal, CNC, or a printed part that is only meant to teach the team. Then draft, wall thickness, radii, hole placement, bend relief, and the tolerances the process can actually hold. A stack-up that only works on one bench unit is called out before a tool is cut.
Design for assembly
Fewer parts, one-way fits, and fasteners a person can reach. Cable exit, connector order, gasket crush, and service access are part of the same drawing set. If the only one who can build it is the engineer who designed it, the design is not finished.
What a review covers
Start before the tool is cut.
The useful moment is after the architecture is clear and before hard tooling or a volume buy. We also join when a quote has come back expensive, a pilot will not assemble, or a supplier has sent a marked-up drawing. The output is a changed model and a short list of decisions, not a slide that says the design is manufacturable.
Questions we get
Is this only for injection-moulded plastic?
No. The same review covers sheet metal, machined parts, printed prototypes that must later become a production process, and the assembly that joins them to a board and a cable.
Do we need a finished CAD model?
A model helps. A clear architecture and a target process are enough to start. We would rather change a sketch than a paid tool.
Will you work with our supplier?
Yes. Supplier mark-ups belong in the model. We write the notes so the shop can build without calling the person who drew it.
Is DFR included?
Reliability is a separate question: loads, environment, and what the product must survive. We name it when it changes a wall, a joint, or a material. We do not treat a DFM pass as a reliability test.
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