This model works with the Clock components kit from the Bambu store.

The dial is pre-coloured with the paint function in Bambu Studio, this you can find in the .3mf file. In case you want to change something, you can do it with the usual paint method.

Assembling:

• Screw the front and back side together with 8 pcs M3 screws (max. length 8mm)
• Insert the nut supplied with the clock kit into the slot on the front, then screw in the clock mechanism from the back until its tight. If it is not vertical or horizontal, doesnt matter.
• Insert the three small hands into the holes as shown on the uploaded picture. There are two types.
• Put on the hour hand, then the minute hand. 
• For the second hand you need to use the black pin provided with the clock component kit. Simply pry it from the hand with a knife. Insert it into the second hand, and push it into the clock mechanism.
   

Regarding the printing, I recommend:

• clean your bed plate with dishsoap and hot water before printing, especially near the edges.
• Eventually use some glue on the four edges, such large obejcts tend to lift, even with PLA.
• Use 20% infill and 0,25mm layer height.

Check my other clocks as well:

IWC Pilot's watch TOP Gun - https://makerworld.com/en/models/1054109

TAG Heuer Aquaracer - https://makerworld.com/en/models/1097544

TAG Heuer Carrera - https://makerworld.com/en/models/1049549

TAG Heuer Grand Carrera - https://makerworld.com/en/models/1229194

Breitling Navitimer World - https://makerworld.com/en/models/1177053

Omega Seamaster Planet Ocean - https://makerworld.com/en/models/1205830