Sneak + right-click a Foundry with an empty bucket to pull lava back out of its tank.

Added

• Tap lava from the tank, sneak + right-click a Foundry while holding an empty bucket to draw out one bucket of lava, the reverse of filling it. Works once the tank holds at least a full bucket. Changed

• Filling or emptying the tank now keeps the bucket in the slot you're holding it in (for a single bucket), instead of shuffling the swapped bucket into a different inventory slot.