This connector system can be used to join filament spools together to stack them up.  It was designed to be used with the drawer system I designed for used filament spools.  Yu can find the Drawer System at the link below.

[https://makerworld.com/en/models/1090611#profileId-1084032](https://makerworld.com/en/models/1090611#profileId-1084032)

NOTE

When printing this, please do not change the orientation of the connector plates or turn off supports.  If you print these flat, the cl;ips become VERY fragile and WILL break…most likely the moment you try to insert them.