In civilian aviation, or in military training and peacetime operations, sure, but in a fly-or-die situation, like the one described in the article where supply

In civilian aviation, or in military training and peacetime operations, sure, but in a fly-or-die situation, like the one described in the article where supply lines are compromised, the ability to print and use a part for emergency use could be a literal lifesaver. It's analogous to replacing fuses with copper bars before entering combat (in some scenarios).