A replacement key head for ABS Avocet keys, bit rough but it works. I've had four of the original key heads break in the same way so needed some replacements.

It's a one piece build and will require a pause set in the slicer to insert the key shaft before resuming printing over the top of it. Having something about 1.75mm tall for the front of the key to sit on while inserting and after the printing resumes would be a good idea.

There's a bit of variation in the shafts but it fit all of them well enough.