In our BOM there are two lists of parts. The first one was compiled with the intent to source the cheapest parts when parts were orders in large quantities. The second list was compiled for our own prototyping needs. Although cost is still a factor for this sourcing, time is a greater factor, and waste also comes into play; we don't want to finish up the class with a whole lot of left-over parts. Many of the parts could be sourced locally, to eliminate shipping time; others were ordered. In either case, the team was reimbursed from the project funds after submission of itemized purchase orders.
Our build procedures are developed to ensure that all critical factors are met both in the building of our prototype and in the larger production expected at B9.
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