Industry: Automotive Manufacturing | Process: FDM (PA12-CF) | Volume: 2,400 pieces | Lead time: 14 days
The Challenge
A leading Gujarat-based automotive component OEM was transitioning their front-axle sub-assembly line to a new body style. The changeover required 2,400 custom jigs — locating fixtures that hold components in precise alignment during welding and torque operations. The previous generation of jigs were machined aluminium, requiring 8–10 weeks of CNC manufacturing time and costing ₹4,800 per piece.
The new model changeover was on a fixed date tied to a customer programme. The window between design freeze and production start was 14 calendar days. Machining was not feasible. The engineering team reached out to Layer X.
Our Solution
We recommended PA12-CF (carbon-fibre reinforced nylon) via industrial FDM. The material offers tensile strength of 60 MPa and flexural modulus of 5,000 MPa — sufficient for the 45 N·m torque loads the jig would see during assembly operations. The build temperature stability (HDT 170 °C) exceeds the 110 °C sustained environment on the production line. And critically, the material does not cold-flow under sustained clamping loads the way standard nylon does.
Layer X ran four simultaneous FDM machines in three-shift operation over 14 days, printing 180 jigs per day across two part numbers. Each part included an embedded steel insert location feature (inserts pressed in post-print) for the locating datum pins. Dimensional inspection was performed on 5% of each batch using a CMM, with full documentation.
Results
| Metric | Machined Aluminium | Layer X PA-CF FDM |
| Unit cost | ₹4,800 | ₹960 |
| Lead time | 8–10 weeks | 14 days |
| Total cost (2,400 units) | ₹1.15 crore | ₹23 lakh |
| Part mass | 1,180 g | 310 g (−74%) |
The jigs arrived two days before the production start date. Zero parts failed dimensional inspection beyond the 2σ control limit. The customer reported that the lighter jigs (74% mass reduction) measurably reduced operator fatigue on the assembly line — an unplanned benefit that improved ergonomic compliance scores.
The programme director quoted: "We expected a compromise. We got a better product in a fifth of the time at a fifth of the cost."
Key Takeaways
- PA-CF FDM is a direct substitute for machined aluminium in low-to-moderate load jig applications
- Industrial batch FDM can reach 180+ units/day with multi-machine scheduling
- Weight reduction from lighter tooling delivers ergonomic and productivity benefits beyond the part specification