There is a new version of this Pegboard Hook for Stackable box V3.   The new version supports the 100x70 size and is more stable and less prone to being dislodged.

Easy print (no support) pegboard mount for the 150x100 Stackable box by @3Dservis. Fits standard US 1" spacing pegboard. The fit for the original profile is intentionally quite tight (it probably won't fit if you try while it's still hot).  The V2 profile has more relaxed tolerances and should fit easily.

If anybody would like one for the other sizes of box please let me know and I'll make one.