Yann Büchau Mar 5, 2024

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

#3dPrinting #CAD #3dDesign #Screwiverse #HSW

Keyguardian: dual-key XOR mechanism by Yann Büchau | Download free STL model | Printables.com

A HSW key holder that releases one key only when a nametag is inserted | Download free 3D printable STL models

Printables.com
Show threadYann Büchau Mar 5, 2024

I chose a kinda print-in-place approach:

The print is paused right before the case is closed, then the moving part is manually removed from the bed with a little snap-off helper lid at the side and put into the case. This works much more reliably than anything I tried with glueing or closing the case otherwise or trying to to actual print in place (failed miserably 😅).

A drop of e.g. silicone oil and the operation is very smooth!

#3dPrinting

Show threadRichard "RichiH" HartmannMar 5, 2024
@nobodyinperson interesting idea! I'd probably preprint the insert or.print it into the enclosing part onto very thin supports that break away with the first activation.
Show threadYann Büchau Mar 5, 2024
@RichiH Preprinting works as well, sure. But that's another step and slows it down, so I tried this one. I tried with the supports, but it's really hard to get right...
Show threadRichard "RichiH" Hartmann

@nobodyinperson not sure if I agree on it taking more time unless you're actively monitoring the print and even then, but it if works for you all good.

Still an interesting idea either way.

Mar 5, 2024 at 8:14pmWeb
Show threadYann Büchau Mar 5, 2024
@RichiH On printables I have put all the base files as well, also without that snapoff latch. For printing many of them at once, printing the moving carriage separately is probably better, right.