Parametric Stackable Gridfinity Tray - OpenSCAD

# Parametric Stackable Storage Tray

OpenSCAD tray with a built-in stacking foot. Set your Gridfinity footprint, partitions, and textures, then print as many as you need.

Repository: https://github.com/ToledoEM/Build_your_tray

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## How stacking works

Each tray has a **foot skirt**: a solid tab below the tray body that drops into the inner cavity of the tray below. The floor slab underside of the upper tray rests on the top rim of the lower tray when seated. A 2° draft taper on the foot outer face and a self-centering chamfer on the bottom edge keep nesting snag-free.

Footprint is set by `gf_cells_x × gf_cells_y` (each cell = 42mm). The Gridfinity base is optional, toggled per tray. When on, GF socket cavities are cut into the bottom face of the foot; when off, the foot is a plain solid tab.

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## Features

**Stacking foot with Gridfinity option**
The foot fits inside the tray below with a gap controlled by `stack_tolerance`. Set `gf_base = true` and the foot bottom becomes a