Antwortete Yann Büchau 
A self-documenting key storage system. You want the garage keys? Insert your name tag to unlock it. Done? Put the key back, free your nametag.
GIF
Working on a more useful evolution of the #keyguardian, my #3dPrinted XOR mechanism thats useful e.g. to unlock garage keys with a name tag for auto-documentation who took them.
This compact board houses 20 of these XOR pairs, so 20 keyrings could be tracked. But I also think this could be turned into a rad #boardGame, what do you think? Tying two of those together with a string is also very fun, I tried.
What do you think?
https://www.printables.com/model/793767-keyguardian-dual-key-xor-mechanism
GIF
@adamsdesk I have a ridiculous pile of keys on several rings, attached with a thin but long rope to my belt with a screw-lockable carabiner. Looks ridiculous and regularly destroys my pockets, but losing or dropping keys is one thing I never want to worry about ever again.
I also designed this #keyGuardian for #3dPrinting to organise keys others also need to use and force everyone to document who took which key:
https://www.printables.com/model/793767-keyguardian-dual-key-xor-mechanism
Keyguardian: dual-key XOR mechanism by Yann Büchau | Download free STL model | Printables.comPrintables.com
Antwortete Yann Büchau
I now also uploaded that version with the label slot to #Printables
https://www.printables.com/model/793767-keyguardian-dual-key-xor-mechanism/files#preview:file-ML2Cu
Antwortete Yann Büchau
I used the #keyguardian to organise these keys. I added a version with a paper label slot and some printed name tags. Works very well! 
I finally made it: an XOR mechanism that requires exactly one of two keys to be inserted at a time. I call it the 
#keyguardian.
This is very useful for example to track where important small things go: Want to take the car keys? You have to insert your name tag to unlock it.
My first mechanical project with #SolveSpace and it was great!
EDIT: Now on #Printables: https://www.printables.com/model/793767-keyguardian-dual-key-xor-mechanism
GIF