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Why these plates fit every Gridfinity bin
None of the Gridfinity geometry here is homemade. Every socket, magnet hole, and plate style comes from Gridfinity Rebuilt, running unmodified in OpenSCAD inside your browser. This page only does the arithmetic: how many cells fit, how to split them for your bed, and how much padding each outer piece gets. Rebuilt's own fit-to-drawer option adds that padding.
The one addition is squaring off the corners where two pieces meet along a padded edge. Without it, Rebuilt rounds every corner of every piece, which leaves a notch in the padding at each seam. The test suite checks that the plates match Rebuilt's own baseplate file exactly before any corners are filled.
Repeat builds are instant. This browser keeps the last 48 STLs it rendered, so building the same pieces again reuses them instead of running OpenSCAD. They're stored on this device only, and a change to the Gridfinity sources makes old copies miss automatically.
Print the test-fit kit first, especially in ASA. It's a 2 × 2 plate and a 1 × 1 bin in your chosen style. If the bin binds or rattles, fix the filament's shrinkage setting in your slicer instead of scaling the model.