This article is about the item used within the Artisans Workshop. For the item used in making tradeable cannonballs, see Ammo mould.
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Cannonball mould detail

The cannonball mould is used to repair dwarf multicannons within the Artisans Workshop. It is required to make a steel ingot II into test cannonballs, using a furnace. Four cannonballs are made from each ingot.

The mould can be found at the cannon barrel desk in the repair room. It cannot be taken outside of the repair area.