So I started my print before I went out to run errands, and when I came back the print carriage was all the way at the top of the Z axis. When I investigated, I found this: Looks like that bit broke off, and now it's winding itself around when I try to adjust the z-axis. Pulled out the wire to the motor, too. Anyway, the broken bit, is it in any way fixable? Is it a send-it-in kind of deal?