Simple and sturdy bin. Internal dimensions W:80mm, D:80mm, H: 80mm. Prints with no supports. 

Additional necessary components

You also need to print the right “peg” for your particular pegboard. I include the file for a typical “Home Depot” pegboard, but below is a parametric generator for any pegboard style.

https://www.printables.com/model/604771-sys-peglock-parametric-pegboard-attachment

Original model and resources

Sy's Peglock

https://www.printables.com/model/249871-sys-peglock-locking-pegboard-system/files

Templated version in Onshape

https://www.printables.com/model/457373-sys-peglock-template-plate-versions-plus-onshape-c