Spool hanger for IKEA Lack shelf (customizable for other shelfs)

thingiverse

This spool holder is designed for various types of spools, including solder, solder braid, wires, and random cables that need to be hung directly from a Lack shelf. The two parts are connected by a 15mm wooden rod, although the design originally called for a 14.6mm rod to match the exact dimensions of the one used. You can print this spool holder with almost any settings and material in mind, and if you want to make changes to its parameters, refer to the attached Fusion 360 file where most dimensions are already parameterized.