It is gridfinity compatible holder for IKEA 804.449.46 glass container. It uses Gridfinity grid/3 (normal gridfinity 42mm, this version is 14mm grid) but is fully compatible with regular gridfinity. I used 14mm because to comfortably grab container from the grid you need approximately 28mm of clearance, and not to waste space I used custom grid created using openscad https://github.com/kennetek/gridfinity-rebuilt-openscad

But for all that matters, original grid is fully compatible, it just looks a little bit weird in my opinion

For base I used Gridfinity generator in Fusion 360 https://apps.autodesk.com/FUSION/en/Detail/Index?id=7197558650811789&appLang=en&os=Mac