Discovered by KurryBroX!

Anything in Brackets = Name of keybind exactly as it appears in the settings menu All binding used here are under "Bindings - Inventory"

Tool/Car Part Duplication

• Fill inventory until the tool you want to duplicate will not fit
• Move the tool adjacent to your inventory
• (Equip) Tool
• (Equip) Something else that is not assigned to hotbar
• Move tool to Hands slot
• Hold (Grab Item) on tool and press (Equip) Twice
• Place tool back into hands slot
• You will now have the tool in your hands and on the floor

Resource Duplication

• Create shared binding between (Drop Item) and (Equip Item)
• Set Resource you wish to duplicate to a hotbar slot
• Hover resource and rapidly press your shared binding until the stack has completely dropped out of your inventory
• You will now have up to twice the amount of resources on the floor
• Craft with or deconstruct the resources you can pickup before picking up duplicates

Anchor Duplication

• Pickup Anchor, Open inventory
• (Equip) Something else that is not assigned to hotbar
• Exit inventory, Pickup Anchor, Open inventory
• Hold (Grab Item) on anchor and press (Equip) Twice
• Place anchor back into hands slot
• You will now have the anchor in your hands and on the floor