I made this as an alignment tool for my wife's Zojirushi short thermal cup. Without it, the cup was frequently in the wrong place and her cocoa dribbled partially down the side. The adapter works well with taller vessels and does not interfere with using a standard coffee mug, so it is now a permanent fixture of our Keurig K450. It worked on another model we have at work, but I don't know which model we have there.
This one was printed with Prusament Galaxy Black, .2mm layer height with no supports required. Works best when printed topside down on a Prusa textured print bed for a really nice topside surface finish. Snaps together when finished and can be undone for cleaning if desired.
The author marked this model as their own original creation.