The ones I linked to in the pic have two (well three including the ptfe) parts: the hinged base lets you flip the ptfe down when loading and unloading, the bit at the end both is designed to prevent tangles and will wear down as opposed to wearing out your AMS intake hole.
I started using them after having a lot of issues with 500g and 250g spools, and had to start using ptfe extenders, but the rigid ones get in the way when you’re inserting and removing spools, so these with the hinge are easiest for me.
3 Likes