Hi, While it seems you can 3D Print some new hands, you can also reduce the chances of chopping one or part of one off with this amazing device. Saw Stop - This guy puts a finger into an active table saw blade & comes away without a scratch! - YouTube
Having once gotten dragged into a bandsaw in a sawmill (did you know that a forearm can literally bend in the middle when propelled by enough fear?) I'll say two things: 1) Great invention 2) That guy's nuts.
Yeah I could probably do what he did, which was more touching the blade than running his finger through it. I could also probably run my hand through a saw again. It's not like I meant to the first time around. I did get a great scar.