Enclosures and housings
Cardboard Mechanical Calculator (Exploded)
- Bounding box
- 2752.0 × 120.0 × 145.0 mm
- Engine
- Precision B-rep
- Parameters
- 32
- Published
- September 20, 2026
Download
Free to download and use. See the terms.
The prompt
A comprehensive, detailed 3D schematic model of a completely handmade mechanical cardboard calculator, showcasing an exploded or transparent assembly view to see all moving parts working together. The entire model is constructed from light brown corrugated cardboard, thin cereal-box cardboard, and wooden bamboo skewers as shafts. The mechanism consists of two parallel vertical axles (wooden skewers): 1. THE ONES AXLE (Right Side): Holds two glued-together cardboard disks. The front disk is an 8cm circle cleanly marked with numbers 0-9. Glued directly behind it is a matching 8cm disk with 10 smooth, wave-like perimeter notches. A tiny, 1cm square cardboard block ("the carry bump") is glued to the very back face of this wheel, positioned right behind the 9-to-0 transition spot. 2. THE TENS AXLE (Left Side): An identical setup with a 0-9 number wheel and a 10-notched wheel behind it. It sits parallel to the ones axle, leaving a 4cm gap between the edges of the two wheels. 3. THE CRANK AND PAWL (Drive System): A small cardboard crank handle sits off to the right. It is linked to a thin, flexible strip of cardboard ("the cardboard finger/pawl") that points downward, with its triangular tip resting gently into one of the notches of the Ones wheel. 4. THE CARRY LEVER (The Seesaw): Positioned horizontally in the gap between the two main axles is a long, thin cardboard lever resting on a central pin pivot. The right tip of this lever sits directly in the path of the Ones wheel's "carry bump". The left tip of this lever is shaped like a finger, resting against the notches of the Tens wheel. The entire aesthetic is a realistic, raw DIY hobbyist prototype resting on a flat wooden workbench. The lighting is clean and directional to highlight the layers, folds, edges, and mechanical contact points of the cardboard pieces. High-resolution textures showing raw cut cardboard edges.
Parameters
| Name | Value | Range |
|---|---|---|
| Exploded Layout Gap | 240 mm | 150 – 400 |
| Dial Wheel Diameter | 80 mm | 40 – 160 |
| Cardboard Wheel Thickness | 2 mm | 1 – 6 |
| Number Markings (0-9) | 10 count | 5 – 20 |
| Engraved Number Depth | 0.6 mm | 0.2 – 1.5 |
| Perimeter Notches | 10 count | 5 – 20 |
| Notch Radius | 6 mm | 2 – 8 |
| Bamboo Skewer Diameter | 4 mm | 2 – 10 |
| Axle Length | 140 mm | 80 – 250 |
| Pivot Pin Diameter | 3 mm | 1.5 – 8 |
| Pivot Pin Length | 20 mm | 5 – 60 |
| Carry Bump Side | 10 mm | 4 – 25 |
| Carry Bump Thickness | 2 mm | 1 – 6 |
| Crank Arm Length | 50 mm | 20 – 120 |
| Crank Arm Width | 20 mm | 8 – 50 |
| Crank Thickness | 6 mm | 2 – 15 |
| Grip Tab Length | 14 mm | 4 – 40 |
| Grip Tab Width | 8 mm | 3 – 25 |
| Crank Axle Bore | 4.5 mm | 2 – 12 |
| Pawl Strip Length | 60 mm | 20 – 150 |
| Pawl Strip Width | 10 mm | 3 – 40 |
| Pawl Strip Thickness | 1 mm | 0.5 – 5 |
| Pawl Triangular Tip | 14 mm | 3 – 40 |
| Carry Lever Length | 100 mm | 40 – 250 |
| Carry Lever Width | 8 mm | 3 – 30 |
| Carry Lever Thickness | 2 mm | 1 – 8 |
| Lever Pivot Hole | 3.2 mm | 1.5 – 10 |
| Chassis Length | 220 mm | 100 – 400 |
| Chassis Width | 120 mm | 60 – 300 |
| Corrugated Base Thickness | 3 mm | 1 – 10 |
| Axle Clearance Hole | 4.5 mm | 2 – 12 |
| Axle Hole Spacing | 120 mm | 40 – 180 |
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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