Machine Knee Cap

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The Machine Knee Cap is a special item in Horizon Forbidden West during the main quest The Sea of Sands. It is one of the components required to craft the Diving Mask.

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Machine Resources
Horizon Zero Dawn
Hearts	Behemoth Heart - Bellowback Heart - Broadhead Heart - Charger Heart - Corruptor Heart - Deathbringer Heart - Fireclaw Heart^FW - Frostclaw Heart^FW - Glinthawk Heart - Grazer Heart - Lancehorn Heart - Longleg Heart - Ravager Heart - Rockbreaker Heart - Sawtooth Heart - Scorcher Heart^FW - Scrapper Heart - Shell-Walker Heart - Snapmaw Heart - Stalker Heart - Stormbird Heart - Strider Heart - Thunderjaw Heart - Trampler Heart - Watcher Heart
Lenses	Behemoth Lens - Bellowback Lens - Broadhead Lens - Charger Lens - Corruptor Lens - Deathbringer Lens - Fireclaw Lens^FW - Frostclaw Lens^FW - Glinthawk Lens - Grazer Lens - Lancehorn Lens - Longleg Lens - Ravager Lens - Rockbreaker Lens - Sawtooth Lens - Scorcher Lens^FW - Scrapper Lens - Shell-Walker Lens - Snapmaw Lens - Stalker Lens - Stormbird Lens - Strider Lens - Thunderjaw Lens - Trampler Lens - Watcher Lens
Quest Items	Arana's Spear - Behemoth Cables - Bellowback Snout^FW - Corruptor Blood - Proving Trophy - Ravager Trophy - Sawtooth Blood - Sawtooth Trophy - Scorcher Claw^FW - Snapmaw Fang^FW - Stalker Blood - Stalker Trophy - Stalker Sinew^FW - Stormbird Blood - Stormbird Talon^FW - Stormbird Trophy - Tallneck Actuator^FW - Tallneck Array^FW - Tallneck Stabilizer^FW - Thunderjaw Blood - Thunderjaw Mandible^FW - Thunderjaw Trophy
Other	Blaze - Chillwater - Crystal Braiding - Echo Shell - Luminous Braiding - Large Machine Core - Medium Machine Core - Metal Vessel - Metalburn - Processed Metal Block - Small Machine Core - Sparker - Wire
Horizon Forbidden West
Circulators	Behemoth Circulator - Bellowback Circulator - Bilegut Circulator^BS - Bristleback Circulator - Burrower Circulator - Canister Burrower Circulator - Charger Circulator - Clamberjaw Circulator - Clawstrider Circulator - Corruptor Circulator - Dreadwing Circulator - Elemental Clawstrider Circulator - Fanghorn Circulator - Fireclaw Circulator - Frostclaw Circulator - Glinthawk Circulator - Grazer Circulator - Lancehorn Circulator - Leaplasher Circulator - Longleg Circulator - Plowhorn Circulator - Ravager Circulator - Redeye Watcher Circulator - Rockbreaker Circulator - Rollerback Circulator - Scorcher Circulator - Scrapper Circulator - Scrounger Circulator - Shell-Walker Circulator - Shellsnapper Circulator - Skydrifter Circulator - Slaughterspine Circulator - Slitherfang Circulator - Snapmaw Circulator - Spikesnout Circulator - Stalker Circulator - Stormbird Circulator (Damaged Stormbird Circulator^BS) - Sunwing Circulator - Thunderjaw Circulator - Tideripper Circulator - Tracker Burrower Circulator - Tremortusk Circulator - Waterwing Circulator^BS - Widemaw Circulator
Hearts	Apex Behemoth Heart - Apex Bellowback Heart - Apex Bilegut Heart^BS - Apex Bristleback Heart - Apex Burrower Heart - Apex Canister Burrower Heart - Apex Clamberjaw Heart - Apex Clawstrider Heart - Apex Dreadwing Heart - Apex Elemental Clawstrider Heart - Apex Fireclaw Heart - Apex Frostclaw Heart - Apex Glinthawk Heart - Apex Grazer Heart - Apex Lancehorn Heart - Apex Leaplasher Heart - Apex Longleg Heart - Apex Plowhorn Heart - Apex Ravager Heart - Apex Redeye Watcher Heart - Apex Rockbreaker Heart - Apex Rollerback Heart - Apex Scorcher Heart - Apex Scrapper Heart - Apex Scrounger Heart - Apex Shell-Walker Heart - Apex Shellsnapper Heart - Apex Skydrifter Heart - Apex Slaughterspine Heart - Apex Slitherfang Heart - Apex Snapmaw Heart - Apex Spikesnout Heart - Apex Stalker Heart - Apex Stormbird Heart - Apex Sunwing Heart - Apex Thunderjaw Heart - Apex Tideripper Heart - Apex Tracker Burrower Heart - Apex Tremortusk Heart - Apex Waterwing Heart^BS - Apex Widemaw Heart
Key Upgrade Resources	Behemoth Force Loader - Bellowback Sac Webbing - Bilegut Sac Webbing^BS - Bristleback Tusk - Burrower Soundshell - Charger Horn - Clamberjaw Tail Duster - Clawstrider Razor Tail - Dreadwing Metal Fang - Elemental Clawstrider Sac Webbing - Fanghorn Antler - Fireclaw Sac Webbing - Frostclaw Sac Webbing - Glinthawk Beak - Grazer Rotor Horn - Lancehorn Drill Horn - Leaplasher Spark Coil - Longleg Wing Burner - Plowhorn Horn - Rockbreaker Mining Claw - Rollerback Hammer Tail - Scorcher Scanning Ear - Scrapper Radar - Scrapper Spark Coil - Scrounger Spark Coil - Shell-Walker Lightning Gun - Shellsnapper Shell Bolt - Skydrifter Razor Tail - Slitherfang Earthgrinder - Snapmaw Sac Webbing - Spikesnout Sac Webbing - Stalker Stealth Generator - Stormbird Storm Cannon - Sunwing Shield Caster - Thunderjaw Tail - Tideripper Tail Fin - Tremortusk Tusk - Widemaw Tusk
Primary Nerves	Behemoth Primary Nerve - Bellowback Primary Nerve - Bilegut Primary Nerve^BS - Bristleback Primary Nerve - Burrower Primary Nerve - Canister Burrower Primary Nerve - Charger Primary Nerve - Clamberjaw Primary Nerve - Clawstrider Primary Nerve - Corruptor Primary Nerve - Dreadwing Primary Nerve - Elemental Clawstrider Primary Nerve - Fanghorn Primary Nerve - Fireclaw Primary Nerve - Frostclaw Primary Nerve - Glinthawk Primary Nerve - Grazer Primary Nerve - Leaplasher Primary Nerve - Longleg Primary Nerve - Plowhorn Primary Nerve - Ravager Primary Nerve - Redeye Watcher Primary Nerve - Rockbreaker Primary Nerve - Rollerback Primary Nerve - Scorcher Primary Nerve - Scrapper Primary Nerve - Scrounger Primary Nerve - Shell-Walker Primary Nerve - Shellsnapper Primary Nerve - Skydrifter Primary Nerve - Slaughterspine Primary Nerve - Snapmaw Primary Nerve - Slitherfang Primary Nerve - Spikesnout Primary Nerve - Stalker Primary Nerve - Stormbird Primary Nerve - Sunwing Primary Nerve - Thunderjaw Primary Nerve - Tideripper Primary Nerve - Tracker Burrower Primary Nerve - Tremortusk Primary Nerve - Waterwing Primary Nerve^BS - Widemaw Primary Nerve
Quest Items	Antenna Salvage - Ballast Regulator^BS - Behemoth Salvage - Corrugated Metal Panel - Fanghorn Rib - Fire Fanghorn Salvage - Grimhorn Control Core - Lancehorn Salvage- Longleg Throat - Machine Knee Cap - Plowhorn Salvage - Pristine Fanghorn Heart - Pristine Ravager Heart - Pristine Stormbird Heart - Scrapper Jaw Salvage - Stalker Mine Launcher - Synthetic Membrane - Wing Membrane^BS
Other	Blastpaste - Blaze - Braided Wire - Chillwater - Crystal Braiding - Echo Shell - Glowblast - Large Machine Core - Luminous Brainstem - Machine Muscle - Medium Machine Core - Metal Bone - Metal Fertilizer Pod - Metalbite - Piercing Spike - Processed Metal Block - Purgewater - Small Machine Core - Sparker - Stickpaste - Stolen Supplies^BS - Sturdy Hardplate - Volatile Sludge