I designed a trouser pattern and printed it on a4 sheets. Then I assembled the grid and checked all the dimensions and found some errors, most significant one is the trouser length which is nearly 2 cm shorter. I checked my drawing for errors, but it seems fine. I found errors in both directions.
I used valentina 4.5 on Linux.
I don’t checked my printer, but I don’t think it comes from it.
I can provide the val file and I am a computer scientist.