The item ID for Fiber Mesh in Subnautica is:
fibermesh
Strong natural fiber. Comfy.
The spawn code for this item is:
spawn fibermesh
The item command will add this item to your character's inventory. The item command for Fiber Mesh is:
item fibermesh
To unlock this item, use the following command:
unlock fibermesh
If you wish to lock this blueprint, after having unlocked it, use the following command:
lock fibermesh