Holds the ends of wire spools to make it easy to pull wire. Mounts to an empty HSW insert.

If holes are too loose/tight, change “Hole Horizontal Expansion”(Cura); positive value if holes too small, negative if too big.

Actual spool holder pictured (not mine) -  https://www.printables.com/model/525788-mini-wire-spool-holder-for-honeycomb-storagehsw