I often buy Sunlu filaments because they are high quality and relatively cheap. There is however one thing missing from their rolls, and that is a leftover filament indicator. So I made one that you can snap onto the spool. This way you can quickly see if you enough left over to print your next project.

The easiest way to install them is to first hook the upper part in and then “snap” the lower part in with your thumbs. Don't be afraid to press down hard, they'll fit, I promise! I've supplied both a multicolor and a single-color version, whichever you prefer, and yes, they work fine in the ams.

Enjoy!