Mount for the Honeycomb Storage Wall Milwaukee M18 Battery Holder. I just designed this and haven't had a chance to test the print and orientation yet. Will test some time this week and update this description.
Remixed from the following STL made by MichaelK:
https://www.printables.com/model/135373-milwaukee-m18-battery-holder
and that was remixed from this model:
https://www.thingiverse.com/thing:2216682
The author remixed this model.