I made this simple model clock for my kids to practice with. It doesn't require any supports to print and only has 4 parts. I colored mine using Bambu studio but the numbers are recessed so you can just switch colors at the correct height if you have a single color printer. 

I used 0.2mm print height and 10% infill with PLA I bought from Hatchbox and Bambu Labs. Overall print took me ~2.5 hours using normal speed with my Bambu X1C. I would recommend printing the arms and cap separately to avoid unnecessary filament waste during changes.