Well said by PhanthomJay. The material property of interest would be tensile yield strength. ihaland, for your given spool diameter, if we assume this is a 6 x 7 stranded cable (a somewhat coarse construction), then the nominal diameter of your cable could go up to 48 mm before you violate the minimum recommended radius of curvature. And the cable diameter could go even higher if your cable has more strands. Therefore, as PhanthomJay mentioned, you will be OK if your cable is stranded; no problem at all. If your cable is solid, the answer is different. Therefore, we would need to know how many strands are in your cable, and the tensile yield strength of your filament material.