I replaced the clock movement in a cuckoo clock for a friend of mine. The replacement movement wasn't quite deep enough for the hour hand to fit onto the pinion without dragging on the clock face. I decided to print a hand with an extender that would fit properly.

To be sure the hands matched, I also created a matching minute hand. Just for fun I created a second, standard version of the hour hand without the extender for anyone who may want a standard set of hands.

CuckooHandHour1 is the standard hour hand CuckooHandHour2 is the hour hand with the extension (You only need one of the hour hands, not both) CuckooHandMinute is the minute hand that matches the hour hands

It turned out very well, see the pictures with the hands installed on a real clock!