Brackets and mounts
Modular Sofa Storage Seat with Sloped Arm/Back Panel
- Bounding box
- 905.0 × 889.0 × 733.8 mm
- Engine
- Precision B-rep
- Parameters
- 32
- Published
- November 5, 2026
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The prompt
Act as an expert furniture engineer and CNC specialist. Generate a comprehensive parametric CAD breakdown (or OpenSCAD code) for an heirloom-grade, heavy-duty modular sectional sofa seat base and sloped universal arm/back panel designed to match the provided style (vertical channel-tufted exterior, clean modern block silhouette, sloping backrests/arms). Use these exact structural and dimensional parameters: 1. COMPONENT 1: HEAVY-DUTY FULL-DEPTH STORAGE SEAT BASE - Finished Outer Footprint: 35.0 inches Wide x 29.0 inches Deep x 19.0 inches Finished Height (including 2.5" wooden feet). - Frame Skeleton: Four solid 4x4 posts (actual 3.5" x 3.5" x 11.5" tall) at the corners, featuring 3/4" x 3/4" outer rabbets. - Full-Depth Storage Box: The storage floor is made of 3/4" Baltic birch plywood mounted flush to the *bottom* interior rails, maximizing internal storage height. - 400 lb Weight Capacity Deck (The Seat You Sit On): The removable/hinged top seat lid is built from double-layered 3/4" Baltic birch plywood (1.5" total thickness) laminated together with an underlying grid of 3/4" x 3.5" vertical stiffener ribs spaced 8 inches apart on center. This prevents any flex or sag under a 400 lb concentrated load. - Leg Mounting: Four heavy 3/8"-16 threaded inserts embedded directly through the bottom storage floor into the bottom end-grain of the 4x4 corner posts, allowing the sofa feet to bolt straight through the base structure. 2. COMPONENT 2: SLOPED UNIVERSAL ARM / BACK PANEL - Finished Dimensions: 35.0 inches Long x 6.0 inches Thick x 26.0 inches Tall at the back, featuring a contoured ergonomic 15-degree backward slope on the inner face (matching the photo's sloped backrest profile). - Internal Structure: A rigid torsion box framed with 2x4 interior studs and sheeted with 1/2" plywood on all sides, wrapped in high-density foam and upholstery. - Top Cap & Charger Port: A 3/4" plywood top cap with a pre-routed 3-3/8" circular pocket (1/8" deep) and central wire conduit pass-through for a 3D-printed wireless charger plug insert. - Exterior Detailing: Designed to accept vertical channel-tufted removable 1/4" outer plywood skins on the sides and back. Output requirements: Provide precise dimensional coordinates, pocket/rabbet depths, and CNC nesting layout specifications optimized for 4x8 sheets of 3/4" and 1/4" Baltic birch.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Width (X) | 889 mm | 600 – 1200 |
| Base Depth (Y) | 737 mm | 500 – 1000 |
| Corner Post Size | 89 mm | 60 – 120 |
| Corner Post Height | 292 mm | 150 – 400 |
| Post Outer Rabbet | 19 mm | 0 – 30 |
| Rail Thickness | 19 mm | 10 – 30 |
| Rail Height | 89 mm | 40 – 150 |
| Storage Floor Thickness | 19 mm | 10 – 30 |
| Seat Deck Thickness | 38 mm | 19 – 60 |
| Stiffener Rib Width | 19 mm | 10 – 40 |
| Stiffener Rib Height | 89 mm | 40 – 150 |
| Stiffener Rib Spacing O.C. | 203 mm | 80 – 400 |
| Foot Footprint | 89 mm | 50 – 140 |
| Foot Height | 64 mm | 20 – 120 |
| Arm/Back Panel Length | 889 mm | 600 – 1200 |
| Arm/Back Panel Thickness | 152 mm | 80 – 260 |
| Arm/Back Panel Height | 660 mm | 400 – 900 |
| Inner Face Backward Slope | 15 deg | 0 – 30 |
| Top Cap Thickness | 19 mm | 10 – 40 |
| Charger Pocket Diameter | 86 mm | 50 – 140 |
| Charger Pocket Depth | 3.2 mm | 1 – 15 |
| Wire Conduit Diameter | 12 mm | 4 – 30 |
| Charger Insert Diameter | 86 mm | 50 – 140 |
| Charger Insert Height | 8 mm | 3 – 25 |
| Insert Wire Pass-Through | 12 mm | 4 – 30 |
| Foam Padding Thickness | 25 mm | 1 – 60 |
| Outer Skin Thickness | 6.4 mm | 3 – 20 |
| Foot Bolt Diameter (3/8-16) | 9.5 mm | 4 – 20 |
| Threaded Insert Diameter | 12 mm | 6 – 25 |
| Threaded Insert Length | 30 mm | 10 – 60 |
| Hinge Barrel Diameter | 12 mm | 6 – 25 |
| Hinge Barrel Length | 60 mm | 20 – 120 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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