Rust Tier 1 (Workbench Level 1) Tech Tree

Item	Research (Scrap)	Tech Tree (Scrap)	Full path (Scrap)
AnchorMisc	15	15	255
Audio AlarmElectrical	15	15	165
Bear Skin RugBuilding	15	15	135
Bee GrenadeWeapons	15	15	75
BeehiveBuilding	15	15	60
Beenie HatClothing	15	15	30
BlockerElectrical	15	15	165
ButtonElectrical	15	15	180
CannonMisc	15	15	315
Ceiling LightElectrical	15	15	135
Chainlink FenceBuilding	15	15	120
Chainlink Fence GateBuilding	15	15	135
ChairBuilding	15	15	45
Chicken CoopMisc	15	15	45
Electrical BranchElectrical	15	15	150
Fire ArrowAmmunition	15	15	435
FlareTools	15	15	360
Flasher LightElectrical	15	15	150
Fluid SplitterElectrical	15	15	195
Fluid Switch & PumpElectrical	15	15	210
FridgeElectrical	15	15	270
Improvised BalaclavaClothing	15	15	45
Industrial CombinerElectrical	15	15	345
Industrial ConveyorElectrical	15	15	315
Industrial SplitterElectrical	15	15	330
JacketClothing	15	15	90
KayakMisc	15	15	60
Large Planter BoxBuilding	15	15	30
Longsleeve T-ShirtClothing	15	15	60
Mail BoxBuilding	15	15	30
Miners HatClothing	15	15	60
Mini FridgeElectrical	15	15	135
OR SwitchElectrical	15	15	180
PaddleWeapons	15	15	45
PlankMisc	15	15	255
Pressure PadElectrical	15	15	165
Prisoner HoodClothing	15	15	105
Reactive TargetElectrical	15	15	195
RugBuilding	15	15	90
SailMisc	15	15	240
Salvaged SwordWeapons	15	15	135
ShortsClothing	15	15	75
Siege TowerWeapons	15	15	345
Small RampMisc	15	15	270
Small Rechargeable BatteryElectrical	15	15	120
Small Water CatcherBuilding	15	15	135
Snow JacketClothing	15	15	75
Soda Can SilencerComponents	15	15	405
SpeargunWeapons	15	15	75
Speargun SpearAmmunition	15	15	90
Spinning WheelBuilding	15	15	180
SplitterElectrical	15	15	135
SprinklerElectrical	15	15	165
Steering WheelMisc	15	15	225
Stone BarricadeBuilding	15	15	90
Storage AdaptorElectrical	15	15	300
SwitchElectrical	15	15	15
T-ShirtClothing	15	15	30
Tank TopClothing	15	15	15
TimerElectrical	15	15	150
Triangle Planter BoxMisc	15	15	45
Tuna Can LampBuilding	15	15	75
Water BucketTools	15	15	15
Wood ShuttersBuilding	15	15	195
Wooden BarricadeBuilding	15	15	135
Wooden Barricade CoverBuilding	15	15	75
Wooden Floor SpikesTraps	15	15	180
XOR SwitchElectrical	15	15	195
Barbed Wooden BarricadeBuilding	30	30	165
Beancan GrenadeWeapons	30	30	450
BedBuilding	30	30	105
BinocularsTools	30	30	405
Boat Building StationMisc	30	30	90
Bucket HelmetClothing	30	30	45
CannonballAmmunition	30	30	300
Clan TableMisc	30	30	90
Combat KnifeWeapons	30	30	375
Compound BowWeapons	30	30	225
Door ControllerElectrical	30	30	180
Drop BoxBuilding	30	30	210
Electric HeaterElectrical	30	30	165
Flame TurretTraps	30	30	465
Floor grillBuilding	30	30	165
Floor triangle grillBuilding	30	30	195
HatchetTools	30	30	60
Hot Air Balloon ArmorClothing	30	30	60
Huge Wooden SignBuilding	30	30	165
Large Solar PanelElectrical	30	30	105
Large Wooden SignBuilding	30	30	120
MaceWeapons	30	30	285
Metal DetectorTools	30	30	150
Metal Window BarsBuilding	30	30	225
Mini CrossbowWeapons	30	30	255
PantsClothing	30	30	105
PickaxeTools	30	30	120
Pistol BulletAmmunition	30	30	390
RevolverWeapons	30	30	420
Riot HelmetClothing	30	30	90
Root CombinerElectrical	30	30	150
Salvaged CleaverWeapons	30	30	315
Salvaged HammerTools	30	30	30
Salvaged ShelvesBuilding	30	30	75
Snap TrapTraps	30	30	210
TelephoneBuilding	30	30	195
Tin Can AlarmTraps	30	30	240
Watch TowerBuilding	30	30	210
Waterpipe ShotgunWeapons	30	30	345
Weapon flashlightComponents	30	30	435
Double Barrel ShotgunWeapons	60	60	405
Engineering WorkbenchMisc	60	60	90
Handmade SMGWeapons	60	60	480
High External Wooden GateBuilding	60	60	330
High External Wooden WallBuilding	60	60	270
Reinforced Wooden ShieldClothing	60	60	195
Satchel ChargeTools	60	60	510
Shotgun TrapTraps	60	60	465
Water WheelElectrical	60	60	75
Wooden Armor InsertMisc	60	60	150
Wooden LadderBuilding	60	60	120
Boat Building PlanBuilding	120	120	210
Blow PipeWeapons	30	—	—
Incapacitate DartAmmunition	30	—	—
Radiation DartAmmunition	30	—	—
Scatter DartAmmunition	30	—	—
Wood DartAmmunition	30	—	—

Costs are from the current-build item data. Research at a Research Table with a found item, or unlock directly through the workbench tech tree with scrap. Full path is the total scrap to reach that node from an untouched tree, prerequisites included — the number you actually pay. A dash means the game files don't carry that figure for the item.