I was looking for this kind of model but couldn’t find one, so maybe someone else needs it too.
In this coupling, on one side the gutter slides 5 cm into the fitting, while on the other side the fitting slides 5 cm into the gutter.

It can be printed without supports and works best when printed with ASA or ABS.

Gutter dimensions:

• Outer diameter: 100 mm
• Wall thickness: 2 mm

This is my first model, so if you have any issues or ideas for improvements, I’d really appreciate your comments.