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Titanium hammers are widely used in carpentry and on construction sites for framing. Think about titanium being about 45% lighter and you'll understand that although they're a lot more expensive they're less fatiguing then wielding a hammer with a steel head if you're on the job all day every day. The theory behind them is that because it's lighter you can swing faster and more energy is transferred to the nail for less effort. They're usually also paired with shock absorbing materials for the handle eg traditional wood to further reduce fatigue. The only justifiable reason for the Silca hammer is travel weight on planes .. or you could buy Abbey Tools and forgo the 3D printing.
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Think about titanium being about 45% lighter
Think about steel hammer heads being available in masses from about 1oz to many pounds. Even for a given face size and properly balanced about the handle axis, steel hammer heads can be made at a wide range of masses by shaping. If there's anything to the Ti hammer proposition, it's not the head mass.
But surely it’s too light, when I hit something I want it to know it’s been hit