This little bracket snaps tightly into 8020/T-Slot extrusion channels (Size 10) and can help organize cables or attach things to the extrusion.

Can be customized to work like a clip (short lengths) or a cover (long lengths).

Can be printed both vertically or horizontally, but I recommend horizontal print for anything longer than a few mm.
Recommended layer width 0.2 - 0.25 (but 0.4 is functional too).
ABS or PLA