I found this out the hard way when a group of us were sewing friendship star blocks. Each of us had our own machine. We started out assembly line style , but having more than 1 person working on the same block was a disaster.
Then we switched to each one making a full block at a time. That worked a lot better. We didn't have to sew the star blocks together or we would have had the same problem again.
Amazing how fussy our craft can be, but then, we aim for perfection don't we. But if you aim low - you won't achieve higher. :)