By any chance, have you tried changing the layer associated with the hatching? In the image you sent, it says that the hatching is in the "-None-" layer.
SW 2018... whether I print directly from SW, or whether I go through a PDF creation the result is the same, the PDF obtained also contains an "empty" hatching when I ask for plain under SW.
I just tried, I was modified to "uni" the material property of the components concerned. I then went into the assembly, I put hatching of the material, so it remained plain, and I printed and made the pdf, same thing, it comes out all white
I think he understood correctly, my joints themselves were in classic "hatching of the material" at 45 degrees. I forced them into the assembly by putting "plain".
So I tried to modify the hatching of the material within the part itself, and to come back to the assembly and this time tell it "hatching of the material", but same thing: ok on SW but white when printed directly / pdf.
No matter how much I look in the settings whether on the sldreg or the drwdot, nothing seems bad to me
At worst I have the option of the hatching scale to get something "black" when printed, but I don't understand why it works with you and with me it doesn't.
I just opened the joint on my own, made a plan with a cross-sectional view, the section appears black in hatching of the material (which I configured) but the same! On the piece alone in preview and printing it comes out white