Spool extender clips for SainSmart filament spools

The SainSmart ABS filament is great, however they come in cardboard spools that are too small for 1 kg of material and the filament tends to slide out. These clips were designed to virtually extend the spool to eliminate the issue. They are pressed into the cardboard and can be reused. I use eight per spool as shown in the photo and they work great.