I actually have Marlin + Octoprint but found out recently that Klipper exist. I read everywhere that Klipper is better but I don’t really get why. I understand that Klipper use raspberry as powerfull calculator instead of the STM32 of the printer, but octoprint is used to send Gcode to Marlin too… So what’s the really difference please?
Edit : I don’t understand how Klipper or Marlin can give better results when gcode and instructions are generated by Cura
You could use multi material with color change on the hour. You don’t even need to flush the nozzle you could have the color gradually change throughout the layer, or print a handful of perimeters only between each hour.
You could have the first sector to be filled with a hole in the shape of the hour number. Then on the hour change print a couple of top layers covering the hole and print the next layer with the next number as a hole. It’s a really cool idea, as long as you don’t use a heated bed and manage your nozzle heating properly to keep your electric bill manageable. Also you definitely want low print speed and some TMC drivers hehe.