What is a DMZ FOB upgrade set?
Your Forward Operating Base upgrades at the 3D Printer: a bigger stash, more Dog Tag Case room, Gunsmith discounts, more Vendor stock. Each upgrade prints from a fixed list of ingredients plus DMZ Cash. A set here is every ingredient for one upgrade, so you can print it the moment you're back at the FOB.
Single ingredients
Short of a few? Every ingredient the upgrades use is sold on its own, from Rigid Synthetics to Prototype RF Modules, and each row says which upgrades on this page need it and how many.
What does each FOB upgrade need?
Every upgrade prints at the 3D Printer, which unlocks at DMZ level 2. Vendor Item Upgrade I works once the Vendor unlocks at DMZ level 5, Gunsmith Upgrade I at level 10 and the Dog Tag Case upgrades at level 20. Tier II upgrades need Tier I first, and Epic Ingredient Printing needs Uncommon Ingredient Printing. Each set row says what it needs.
Why buy ingredients instead of farming them?
Ingredients turn up in set places across the exclusion zone, the rarer ones in far fewer of them, and some only drop from bosses: Military Composites from the Colossus, Prototype RF Modules from the Deathstalker. Buying the set skips those runs.