I found this model on Printables https://www.printables.com/model/70622-castle-wall as my kids wanted me to print a little castle.
This model has been created by EmmaL ( https://www.printables.com/@EmmaL_101520 ) and released under the CC Attribution-ShareAlike 4.0 Licence ( https://creativecommons.org/licenses/by-sa/4.0/ )
All credit belongs to her.
For my kids i used 4 towers, 1 gate and 3 walls and colorized them all.
The great thing about this model is, that you can decide which parts you want to use as you can interconnect the parts. So you could print a real big castle :-)