If you want to carry your keys without a big tangle, I recommend this key organizer.

In this version you can insert more than 6 keys, you just need to recover 2 screws and 2 bolts of 4 mm,
Instead in the FULL version, you can also print the screw with the bolt.

Instructions:

The assembly is very simple:

1: insert the 4 mm nuts into the appropriate slots;

2: take the other part of the key ring and insert the 4 mm bolt;

3: alternate a key and a washer (I made 6 sizes of washers ranging from 0.5 mm to 3 mm)
in order to fit all the keys,
I also made a special spacer to be able to put a ring or a hook;

4: screw the bolt and tighten it until the keys are well fixed but not too much because they must be able to rotate.

6: Enjoy your new keychain

If you want to insert more than 6 keys, you will need to insert a longer bolt