One answer is that the Master Smith might be able to make lesser devices on the fly. Another is that the Master Smith might be able to use technical knowledge to interfere with devices used by the Forces of Evil.
Class Skills: Attack (heavy), Craft (all), Defend (resist), Device, Knowledge (arcana, science)
Skill Points per Level: 3+Int modifier
Investment Points per Level: 3+Wis modifier
Hit Die: d4
Class FeaturesProficiencies: You are proficient with one type of weapon and one type of armor.
Spellcasting: You are able to cast spells. You select two of the spell lists associated with your artificer class skills, and your saving throws are Intelligence-based. You learn two spells each level.
Master Crafter (Ex): You add one-fourth your level to all Craft checks.Extra Spell List: Every three levels, choose a spell list. If you already had that spell list, you gain a cumulative +1 competence bonus when casting spells from it. If you did not, you now have that spell list.Comprehend Items (Su): At second level, you may spend six continuous ticks scrutinizing a magic item. If you do, you may make a Perception check (DC 15+2 x total rune anchors) to learn the property tied to one of its rune anchors.Runeless Enchantment (Su): You may enchant items without using rune anchors. When you enchant an item, you treat it as though it had an extra number of rune anchors equal to one-fifth your level.Rapid Enchantment (Su): At seventh level, you may place temporary enchantments on magic items. You may grant a weapon a quality by casting every spell involved in granting that quality. This lasts until one of the needed spells lapses. You may do this once per day at seventh level, and an additional time per day for every four levels thereafter.Item Suppression (Su): At thirteenth level, you may suppress magic items. If you touch a magic item, you may make a Device check (DC 20 + 3 x total rune anchors). The item loses all magical properties. To maintain this effect, you spend three ticks each round.At fourteenth level, you may use ranged attacks to do this.At seventeenth level, you may do this to all magic items within a number of feet equal to your level.