This is a replacement handle for the larger Lock & Lock/LocknLock boxes with two handles in the lid. I used it for a 16l box which I use to store filament roles. It should also fit the other large boxes (untested).

It requires a bit of support for the pegs holding the handle in place. Slightly sinking it into the build plate reduces the overhang of the curvature.

Printed mine from ABS with PLA supports with 3 wall layers.