feat: nix dev shell with Android SDK 34, JDK 17, gradle

2026-06-12 00:28:27 +02:00
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+# Corner Decoration — Design Spec
+
+**Date:** 2026-06-11
+
+## Overview
+
+A 1-meter-tall decorative piece for a 90° wall corner. Twisted flat ribbon blade emerging from a hollow triangular spine. Split into 4 × 25cm 3D-printed pieces. Cable routing channel through the spine.
+
+## Geometry
+
+### Overall
+- Total height: 1000mm (4 × 250mm pieces)
+- Corner angle: 90°
+- Ribbon protrusion: 80mm from corner to ribbon centre axis (along 45° diagonal); ribbon extends 50mm either side → near edge at 30mm, far edge at 130mm from corner
+- Twist rate: 360° per 250mm piece (ribbon returns to same orientation at each joint)
+
+### Ribbon Blade
+- Width: 100mm
+- Thickness: 4mm
+- Cross-section: flat rectangle (blade / ribbon profile)
+- Path: helical, centered on the 45° diagonal axis of the corner
+- One full twist (360°) per piece — top and bottom faces of each piece are geometrically identical
+
+### Triangular Spine
+- Profile: right isosceles triangle, legs ~20mm × 20mm
+- Sits flush in the 90° corner; hypotenuse face at 45° to both walls
+- Two flanges (~5mm thick, 20mm wide) extend along each wall surface for gluing
+- Cable channel: 12mm diameter circular hole through the centroid of the triangle, running full height
+- Ribbon attaches at the midpoint of the hypotenuse face
+
+### Piece Joinery
+- Alignment peg: 4mm square peg on top face, matching socket on bottom face
+- Cable hole aligns automatically via peg
+- Pieces glued wall-to-wall and to each other with construction adhesive
+
+## Print Settings
+
+| Parameter | Value |
+|-----------|-------|
+| Orientation | Vertical (upright) |
+| Supports | Required (ribbon overhangs during twist) |
+| Layer height | 0.15mm |
+| Infill | 15% gyroid |
+| Material | PLA |
+| Pieces | 4 identical pieces |
+
+Fallback if supports leave bad finish: split each piece into spine + ribbon, print separately, glue.
+
+## Generation
+
+Python script using **cadquery**. All dimensions as named constants at top of file. Outputs one STL per piece (all 4 identical).
+
+### Key construction steps
+1. Build spine: extrude right-isosceles triangle profile × 250mm, subtract 12mm cylinder for cable hole, add flanges on two legs
+2. Build ribbon: sweep a 100mm × 4mm rectangle along a 250mm helix path (pitch = 250mm for 360°/piece), centered on the 45° diagonal axis
+3. Boolean union spine + ribbon
+4. Add alignment peg (top face) and socket (bottom face)
+5. Export STL
+
+### Parameters (all tunable)
+```python
+PIECE_HEIGHT     = 250   # mm
+NUM_PIECES       = 4
+RIBBON_WIDTH     = 100   # mm
+RIBBON_THICKNESS = 4     # mm
+PROTRUSION       = 80    # mm — corner to ribbon centre axis along 45° diagonal
+TWIST_DEG        = 360   # degrees per piece
+SPINE_LEG        = 20    # mm — triangle leg length
+FLANGE_WIDTH     = 20    # mm
+FLANGE_THICKNESS = 5     # mm
+CABLE_HOLE_DIA   = 12    # mm
+PEG_SIZE         = 4     # mm square
+PEG_HEIGHT       = 5     # mm
+```
+
+## Mounting
+
+- Glue flanges to both walls with construction adhesive (e.g. Liquid Nails)
+- Stack pieces bottom-up, aligning pegs
+- Thread cable through spine channel before gluing upper pieces
+- No visible hardware