Needed a gridfinity bin for my Combination square.  Couldn't find one I liked.  I built this one using the OpenScad generator found here:  https://makerworld.com/en/makerlab/parametricModelMaker?designId=1699341&from=model_page&modelName=gridfinity_odd_shaped_cup.scad&protected=true&unikey=26bf58e8-36c6-4f83-af58-27206565f1f3  

Then, I cut it in half and added registration pins in Orca Slicer so that it would fit on a 256x256 plate. The  sides are a little weak.  I may redo with stronger sides.