Bin Geometry

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Overview

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Base Profile

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Z-Profile Structure

• Layer 5 is a full-width slab (no shrink) from Z=2.95 to Z=4.75mm
• Layers 1-4 create the stepped chamfer profile for baseplate interlocking
• Each layer uses a tapered extrusion where top and bottom widths differ

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Per-Cell Base Generation

• Each cell gets its own complete Z-profile base
• Cells are positioned at 42mm spacing
• A full-width slab bridges the inter-cell gaps at Z=2.95→4.75mm
• This ensures proper interlocking across the entire bin footprint

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Body Geometry

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Dimensions

// Outer dimensions
outerWidth = (cellsW × 42mm) - 0.5mm tolerance
outerDepth = (cellsD × 42mm) - 0.5mm tolerance
bodyHeight = heightUnits × 7mm

// Inner cavity
innerWidth = outerWidth - (2 × wallThickness)
innerDepth = outerDepth - (2 × wallThickness)
cavityHeight = bodyHeight - bottomThickness

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Corner Radius

• Default: 3.75mm (official Gridfinity specification)
• Range: 0mm (sharp) to 3.75mm (standard)
• Inner radius: max(0, cornerRadius - wallThickness)
• Corner radius is clamped to prevent exceeding bin dimensions

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Wall & Bottom Thickness

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Features

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Stacking Lip

• Height: 4.4mm (constant GF.STACKING_LIP_HEIGHT)
• Profile: Mirrors the baseplate socket profile
• Location: Added to the top rim of the bin
• Prevents bins from sliding when stacked

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Label Shelf

• Angle: 45 degrees (constant GF.LABEL_ANGLE)
• Default width: 12mm (constant GF.LABEL_DEFAULT_WIDTH)
• Configurable: Can be adjusted per bin
• Geometry: Wedge-shaped cutout that tapers from full depth at rim to outer face

• Full cut at the rim (bodyTopZ)
• Tapers to outer wall face at bodyTopZ - shelfHeight
• Extends across the full bin width

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Magnet Holes

• Diameter: 6mm + 0.5mm clearance = 6.5mm actual
• Depth: 2mm + 0.4mm clearance = 2.4mm actual
• Position: 4 holes per cell at each corner
• Inset: Calculated to clear corner radius: max(8.0, cornerRadius + holeRadius + 1.0)
• Deduplication: Internal corners in multi-cell bins share holes (no duplicates)

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Screw Holes

• Diameter: 3.2mm (M3 clearance)
• Depth: Through base (4.75mm)
• Position: 4 holes per cell at each corner
• Inset: Same calculation as magnet holes
• Purpose: Alternative attachment method for non-magnetic baseplates

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Interior Dividers

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Configuration

• dividersX: Number of vertical walls parallel to Y-axis (divide X span)
• dividersY: Number of vertical walls parallel to X-axis (divide Y span)
• Range: 0 to 9 per axis
• Thickness: Same as wall thickness (1.2mm default)
• Height: Full cavity height

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Spacing

// X dividers (vertical walls dividing width)
for (let i = 1; i <= dividersX; i++) {
  x = -innerW/2 + (innerW / (dividersX + 1)) × i
}

// Y dividers (vertical walls dividing depth)
for (let i = 1; i <= dividersY; i++) {
  y = -innerD/2 + (innerD / (dividersY + 1)) × i
}

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Multi-Cell Bins

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Cell Spacing

• Cells are positioned at 42mm intervals along X and Y axes
• Each cell is centered relative to the bin center
• Offset calculation: (cellIndex - (cellCount - 1) / 2) × 42mm

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Base Profile Generation

1. Generate individual Z-profile bases for each cell
2. Position each base at its cell offset
3. Union all cell bases together
4. Add a full-width slab to bridge inter-cell gaps (Z=2.95→4.75mm)

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Hole Deduplication

• Have only one set of holes (not duplicated)
• Use position rounding (0.01mm precision) to detect overlaps
• Prevents interference and unnecessary geometry

• 4 corner holes at outer corners
• 1 shared hole at the center
• Total: 5 hole positions (not 16)

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Geometry Pipeline

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CSG Algorithm

1. Base — Per-cell Z-profile bases + full-width slab
2. Outer shell — Rounded box for body dimensions
3. Inner cavity — Subtracted to create hollow interior
4. Union — Base + hollow body
5. Subtract — Magnet holes, screw holes, label shelf
6. Add — Interior dividers, stacking lip

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Preview vs Export

• Simplified flat base (single slab, Z=0→4.75mm)
• Faster generation for real-time interaction
• Includes all features for visual accuracy

• Full 5-layer Z-profile base per cell
• Exact dimensions for printing
• Manifold watertight meshes