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

Build spine: extrude right-isosceles triangle profile × 250mm, subtract 12mm cylinder for cable hole, add flanges on two legs
Build ribbon: sweep a 100mm × 4mm rectangle along a 250mm helix path (pitch = 250mm for 360°/piece), centered on the 45° diagonal axis
Boolean union spine + ribbon
Add alignment peg (top face) and socket (bottom face)
Export STL

Parameters (all tunable)

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

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