Solid models play a useful role in the engineering design world. There are many benefits to using solid models in the design process, not the least of which is the three dimensional perspective of the design. But as good as solid models are, they have their limitations.
Solid models are instrumental in helping the prototyper to more clearly picture the part from various perspectives. That certainly has its advantages. But the solid model cannot replace the specifications provided on a drawing, especially for critical dimensions, and above all, the solid model is no substitute for a thorough briefing by the designer. Calling attention to critical dimensions in the part design that must be achieved in order for the part to function as intended in the final assembly is not something you want to leave to chance.
The best insurance for a successful prototype is to start with a carefully structured checklist that is itemized and covers every little detail in the design from the critical on down. Nothing ever should be left to chance.
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