Hello There!

Spool perfect for A1 mini and A1.

The small piece at the 2nd plate is for locking the spool, as on the last picture in the gallery.

The spool is a way different from others.

I spent a lot of time eliminating things that made me angry, which led me to develop a spool that met my requirements.

1. I think you will like it because the filament clip is extremely friendly and does not bend the filament → you will not lose any millimeters due to bending. 
2. The filament, once secured, does not seep outside the spool's rim which allows for tight storage. 
3. Spool has also designed the interface to stack the spools on top of each other as needed. magnifications on the corners prevent the filament from unrolling as in other mini designs. 
4. However, the maximum overall dimension equals the original spool and so there is no problem with compatibility with AMS light. 
5. The spool allows you to tuck it back into the cardboard box from the refill.
6. Extremely fast in printing with perfect quality
7. Designed to save material and to be robust at once

The Spool LOOKS so cool (in my opinion)