Patch 10.0.7 has brought a significant change to the Public Work Order system. Players who are placing Public Orders no longer have to supply all reagents.
Public Crafting Order Change
In Patch 10.0.7, players are no longer required to supply all reagents for their craft when placing Public Orders. Despite this change, players are still required to supply BoP materials like Primal Chaos and Spark of Ingenuity. An exception to this rule is Artisan’s Mettle.