A full 1/4 inch seam for me just wont make a block the required size. It always comes out too small.
Dosnt matter if it is a quilt for me but to make a block the correct size for a project for my quilt group where we all contribute blocks it has to be exact.
So have to adjust my needle on both of my machines.
It took a bit of doing but have it right now on both.
I even bought 1/4 inch feet but my blocks still came out to small.
One of my machines even has a setting for 1/4 inch but it did not work and still have to move my needle.