Rigid Synthetics
Uncommon printer ingredient used for backpacks, vests and FOB upgrades.
Also handed out as a DMZ Level reward, and printable itself once the 3D Printer is upgraded. Its item card lists the Medium Backpack and the Disposable Parachute among its uses.
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Sources
- Official FOB guide (Call of Duty blog) callofduty.com
- Official FOB guide, 3D Printer slides callofduty.com