This is printed in one piece, by pausing in the middle of the print, and placing the cardboard dial pieces, before resuming the print. I do this with a color change in the gcode and then just insert the same color again.
I recommend putting some masking tape on the side that will face up when continuing the print, to prevent damage to the Dial pieces. Making sure to cut the circle out of the masking tape before putting it over.
I printed at 0.1 layer height and also increased perimeters until there was no infill left, but you don't have to.
The author marked this model as their own original creation.