Case Study: Spare Parts on Demand with 3D Printing

Background

A mid-sized manufacturing company faced a classic problem: an older machine from the 1990s was no longer supported by its manufacturer. Critical plastic housings, guide rails, and clip elements were no longer available for purchase — lead times for reproductions from traditional suppliers were 12–16 weeks.

A machine downtime of more than two days would have incurred production costs exceeding €40,000.

Solution: Digitization and 3D Printing On Demand

Step 1: 3D Scanning the Original Parts

Intact remaining parts were captured with an industrial 3D scanner (resolution: 0.05 mm). The resulting point clouds were converted into CAD models and optimized for manufacturing.

Step 2: Material Selection

The original parts were ABS. Two materials were evaluated for the reproductions:

• ABS: Similar properties to the original, proven choice
• ASA: Improved UV resistance and weather protection

The decision was made in favor of ASA — since parts of the machine are occasionally exposed to sunlight.

Step 3: Prototypes and Validation

First prints were installed and tested in operation over two weeks. All fits and mechanical properties met the requirements.

Step 4: Digital Inventory

Rather than building physical inventory, the validated CAD models were stored in a digital library. Spare parts can be produced within 24–48 hours on demand.

Results

Lessons Learned

• Scan early: Critical parts should be digitized while originals are still available
• Material testing is mandatory: Not every print material behaves like the original
• Digital inventory scales: The investment pays off with every subsequent order

Conclusion

3D printing as a spare parts strategy is not a stopgap — it’s a strategic tool for securing machine availability. Especially for legacy equipment without manufacturer support, it opens up entirely new possibilities.