As somebody who has also lost a chunk of my finger to a mandolin (regrew including print) this thread has convinced me that mandolins are just not worth it.
There are a lot of places that we were seeing users drop off the radar when trying to install. Through a combination of logging analytics and user studies we figured out what the main problems were and designed this flow to solve them.
(See my post from last week for more context on why we built this: https://news.ycombinator.com/item?id=8168792)