I made a test print of this model and it fits on one of the three Tertial switches I have purchased over the years. The other two switches are too big. But now that I know that, I'm probably going to remix ;)
@mattsches_1663298 have you tried printing the original and test if that fits for the other two?
I was under the impression that the original was made for a US-version of the tertial, but it might instead be that they at some point just change which switch they use.
Would you be able to send a side-by-side picture of the switches you have?
I'd like to figure this out and be able to update the model description if need be.
Printed with Sunlu PETG.
Used variable layer height and got quite nice surfaces.
Parts are fitting quite well.