These are replacement buttons for the original Pebble watch. Now that there are no warranties, use this to fix the watch if the buttons ever fall off.
0.1 layer height will work best, but anything less than or equal to 0.2 will work.
This piece is very small, it will require some sanding and painting to look correct.
Sand it down, then paint it
This will help it fit in with the rest of the watch.