CURTA Mechanical Calculator – 3D-Printed, 3× Scale Replica

This is a meticulously crafted 3× enlarged replica of the legendary Curta hand-crank mechanical calculator, faithfully scaled up from the original design. All ~400 components are reproduced in precise proportion based on authentic blueprints, and the assembled unit is fully functional—capable of performing addition, subtraction, multiplication, division, and even square roots, just like the vintage original. 🔧 Key Features

Scale: 3× magnification of the original Curta Type I
Finished Dimensions: Approx. 300 × 150 × 150 mm
Customizable Shell Color: Choose your preferred exterior hue
Premium Build Options: Entire housing can be printed in carbon fiber-reinforced filament for a high-end look and enhanced rigidity

⚙️ Enhanced Durability & Performance

Main Crank Shaft: Precision-machined CNC stainless steel shaft — eliminates the common "broken axle" issue found in all-plastic replicas, delivers smoother rotation and superior tactile feedback
Support Shafts: Upgraded to metal axes throughout for increased structural integrity and long-term reliability
Critical Internal Components: Printed in PETG for dimensional stability, minimizing tolerance drift and maximizing calculation accuracy
Digits & Markings: Multi-color 3D printing ensures crisp, permanent numbering—no fading or peeling over time
Housing Material: High-quality PETG — durable, impact-resistant, and less prone to warping than PLA

📌 Important Notes

This is a fully operational, faithful 3× scale reproduction of the original Curta mechanism—not a static model.
Contains nearly 400 individual parts, all assembled by hand with exacting attention to mechanical fidelity.
Do not force or misuse: While robustly built, it remains a precision mechanical instrument. Gentle operation is essential to maintain longevity and accuracy.
Ideal for educational demonstration, mechanical engineering enthusiasts, vintage tech collectors, and horology-inspired makers.