What model do you have? I agree that the Roland (XC-540 here) take up reels aren't engineered very well....(although I don't have any other brand to compare to).
I can rarely print more than an half roll before it starts walking/head striking.
Drill a hole in the top and get a nut welded to add another screw/bolt with knob to tighten!
Spoke too soon. here it is after one day.