I have made a set on which I want to add a support, but I don't know how to do it at all. In order for you to understand better, I am posting a photo with, in red, what I want to add. You will find the photo attached.
Could you tell me how I can create this on my piece?
The easiest way is to create a sketch on the side of the part and make a straight line on the 2 end points. Then make a thin extrusion to the opposite surface.
I do not want to upset you, but for me what you are proposing does not give the expected result.
I grant you that the drawing @ceyhan.gvn is not incredibly clear either: especially since one wonders why this complicates life to make just two unfortunate gussets. Unless it's a sheet metal with three plies???
What is not clear in @ceyhan.gvn 's drawing is the red line that connects the two gussets , the top of the vertical plate, nor what looks like a flat iron or sheet metal on the bottom horizontal plate.
@ceyhan.gvn
1°) Could you make a slight effort to specify what the red line on the top of the vertical plate corresponds to. 2°) can you specify "" set on which I want to add a support, "" because you already have a horizontal plate that supports the filter and it's not its weight that will make it bend. 3°) what is the nature of the support you want to create (gusset, flat iron, sheet metal, shaped, etc, etc, ...
In fact, the whole thing will be made of Plastic (PPH), and the different elements will be welded (glued). The goal is to add a PPH plate to form a kind of square and to prevent the weight of the filter from breaking the support.
So in practice we will glue a plate between the two opposite edges to hold the whole thing together.