When quilting on my longarm machine, I put a strip of blue painters tape across my quilt at the point that I need to stop to prevent "bumping" into the stopping place (the place that my machine head will go no further.) This has shows me not to try to go past that point and have "bump" in my stitching. When finished, I just take it up, roll my quilt, and re-use it on the next pass.
Another tip: I found that one of my medicine bottles for large pills, is exactly the right size to drop my "used" rotary cutter blades into. It can probably hold 50 or more.