All the designs are ready to print just remember to set a 0.2mm as maximum, 0.3 or more will not print well.

The support are not required in the settings.

Print first the holder so you can have the right orientation on every magnet in the caps.

To print the caps I recommends using dark colors for the body and bright color for the letters/logo, that way are easy to identify in your backpack.

Use N1 or 19mm or 3/4 binder clips, it is the smallest one for paper, the arm it is just great as a spring for mechanisms.