@emacsimize I think you could improve the strength of the mounting pin by printing it so that the layers are parallel to the slot instead of perpendicular. This would require printing the key in two pieces, but you could easily make a female pin slot in the key cap which could be joined by acetone fusing or super glue. I suspect that the strength would be WAY better if printed in this way and would greatly reduce the chance of snapping the pin off in the switch.
I could even imagine finding or cutting a piece of plastic to use in this situation as the pin so that it is stronger than the printed parts. Maybe laser cutting some thin acrylic could work? What are your thoughts @jesse