Keyholder for regular sized keys. It works like a swiss army knife. On both ends a bolt goes through on which the keys are attached. You can fold them out to unlock the lock and put them back in to make it a compact keyholder.
To essemble I used a M5 sleeve nut with M5 bolt. It is recommended to use loctite or a similair product so the bolt won't get loose.
The STL file seems to have problems with the preview, but when it opens in Cura in the layer view, the model seems okay. If anyone have tips to prevent this, I love to hear it and learn more about modeling.