Sunlu filament is great and works very well with the AMS.

The spools are VERY lightweight so when they get low, the AMS can tug on them and cause them to go wonkey in the AMS.

This is a simple weight to add to the spool, no attachment required. Just slip it through the hole and it will ride low on the spool keeping it running smooth.

Full of ¼ inch ball bearings, it weighs 375 grams. 

(Amazon of course - 1000 will make 4 of these at about 300 grams each, plenty heavy. - I used these exact BBs.)

https://www.amazon.com/dp/B09KSDQ4KN

Easy to hot swap in even on running spools, just slide it in.

Printed in PETG for durability.

Happy printing!