The originial Korda Leader Safe is too expensive for what you get so I reversed engineered it, this way it's cheaper and easier to get fast if you need it.
This Korda Leader Safe stores 3 leader lines.

Printed in 4 pieces so its easier to assemble.
Printed with 0.05mm clearance (let me know if your printer is not accurate enough, I will change the clearance).

Also this one has the same dimensions as the original piece so it will fit easily in the Korda Tackle Box.

!note
If you do not have bambulab support, you can use PETG as the interface layer for supoprt.