Filament spool spindle

When the filament spool has a core hole too small for the spindles on your printer this hooks on to the lip of the case and allows you to use spool with a small diameter hole. I ran into this when I bought some Taulman "Bridge" nylon filament. It is designed to hang on a slight angle to keep the spool on the spindle without requiring any kind of keeper on the end of the spindle. It will hang a Bridge spool above the spindle on the back of the machine without having to remove the machines built in spindle. Bridge comes on 1lb spools, the spindle should be able to support a 1 kg roll though may require removal of the built in spindle for clearance.