As for the walls of the stable, I focused to fix the problems I made in the shed.
I made several attempts, and at the end I found a solution for a modular roof.
I’ll show them in chronological order.
The 3D model
The first version of the roof is a smaller version of the shed’s roof: some boards with nails.
I put a base in the bottom part of the roof to help the 3D printing phase.
Since it has to be placed on top of the walls, I made it a bit larger than 5cm (2 bases). Unfortunately I didn’t 3D printed it because I didn’t like it.
Here how could it be once finished