Either way is considered "proper".
To a certain extent, how you press each unit will depend on what the units will be set with/in.
I prefer to press most of the seams to one side because it is easier for me to get the intersections "right" that way.
Other people press all of their seams open.
These blocks were finger(nail) pressed. I've found that many times that is adequate pressing while a block is being constructed.
The bottom line for me is - it depends. I have no problem with using "mixed methods" when assembling a block. A few years ago it had to be "all one way" - but now - whatever works!
When chain piecing, I now "sew" about 1/2 inch between each unit - because I feel that leaving about 1/4 inch of thread extending beyond the fabric helps minimize pulling apart of the pieces.
Last edited by bearisgray; 07-24-2014 at 05:50 AM.