By using simplifying techniques to not only reduce the number of parts in a design but to also reduce the number of steps in the assembly, cost for manufacturing can be drastically reduced. Here I started with a common flashlight with 18 total parts and 14 steps in the assembly.
By using simplifying techniques to not only reduce the number of parts in a design but the number of steps in the assembly cost for manufacturing can be drastically reduced.
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flashlight

Flashlight