This is a replacement cap for the Uni Kuru Toga eraser, in case someone misplaced it.
The fit is quite precise, you will most likely need to tweak a few things, mostly X-Y Hole compensation.
There are 3 variations :
It's made to be similar to the original one while being easily printable.
The specificity of this design compared to the others is that it pushes on the plastic that holds the eraser like the original one.
The author marked this model as their own original creation.