clip on spool holder

i designed this spindle to clip onto the edge of a wire shelf which my printer sits on top of. it should fit most spools with a center hole larger than 35mm and less than 10cm deep. holes run through the clip portion to allow zip ties to be threaded through for extra secure hold.

i've uploaded a new version on the object to correct some issues with my own printout, strengthening the clips and enlarging the holes. in the original the clips were weak and could snap off, the temporary solution t