Another example of this is BAE Systems Regional Aircraft, which turned to additive manufacturing to stock up on a small but important part that was no longer feasible for the original supplier to make. Colleague Tony Osborne has the full, $ubscribers-only version of the story here, but in a nutshell, the supplier no longer had the tooling needed to make the parts--plastic breather pipes used as vents to keeps cabin windows from misting--and re-investing in it was cost-prohibitive for all.
So BAE Systems turned to its military colleagues, who have printed some parts for use on a flight test aircraft. Working with a third-party additive manufacturer, they developed a workable and cost-effective solution, cutting lead time by several months and saving $23,000 in tooling costs. BAE Systems now has about 300 of these little gems in stock for its regional airline customers.