I tried them all and nothing would snap on to the AMS buttons of my two new units purchased May 2024 so I downloaded this file and hacked away at it in MS 3D Builder to create one that actually snapped on to my AMS and did not rattle or easily come loose. I added a bullseye dimple that your thumb naturally gets traction on and makes loading a breeze.

I printed in PLA+ - Plenty strong and snappy. PLA would likely be fine too but I like at least PLA+ for any functional parts. 

20mm Bambu PTFE tubes add guidance and smooth feeding. I tried Capricorn tubing and the ID was a little too tight and there was a little drag. The PTFE fits very tightly and wont come out. Steady even pressure to install without kinking the PTFE is required. “Use the Force” as they say. :P (I was unable to add a PTFE tube as a BOM item but pretty sure y'all have some laying around.)

https://us.store.bambulab.com/products/bambu-ptfe-tube

Def an item you want on your machine from new to avoid any wear and tear from abrasive filament.

Enjoy!