While the KSC-70 stand for the FP-30 and FP-30X digital pianos comes with some sticky mounting pads for cable management, I wanted something that could be easily removed while not standing out too much. I also wanted to keep the cables close against the leg for a cleaner look. This clip is what I came up with. It's designed to slide over the back of the stand and has a section to hold the power adapter cable and the cable for the KPD-70 pedal unit.

The filament you use shouldn't matter much. PLA will work fine as long as the piano isn't in a very hot room. I recommend using at least three walls in the print for strength.