In the world of manufacturing, not all tolerances are created equal. Many additive manufacturing (AM) service providers list typical tolerances, often with fine print like “geometry dependent” or “may vary with build orientation.” But what happens when your project can’t afford that ambiguity?
At Graphite Additive Manufacturing, we go beyond offering ‘typical’ by providing guarantee you can rely on.
In this post, we break down the difference between typical vs guaranteed tolerances, and why this matters for engineers building functional prototypes or end-use components.
Typical Tolerances: The Industry Norm
Most 3D printing providers publish typical tolerances which are approximate ranges that are achievable under ideal conditions. For example:
- ±0.2 mm up to 100 mm
- ±0.5% of length for larger parts
But here’s the catch – these values are:
- Non-binding
- Often geometry dependent
- Valid only for standard materials and default settings
- Subject to change without guarantee
This works fine for non-critical parts. However, for engineered components and production parts, this poses a significant risk, especially where precision and consistency are crucial.
Guaranteed Tolerances: Graphite’s Commitment to Precision
At Graphite AM, we take it a step further by guaranteeing a defined tolerance band, rather than merely listing what’s “typically achievable.”
This means:
✔ We will work with you to define and inspect agreed tolerances for features that are critical
✔ Where possible, we will work with you on design optimisation to keep costs down
✔ We engineer the print strategy to meet that target, considering:
- Build orientation
- Post-processing
- Feature-specific compensation
✔ We flag features where tolerances can’t be met before production starts
✔ Our tolerances are based on proven performance, not estimates
No surprises. No fine print. Just the precision you need, delivered on schedule.
Why This Matters
✅ Reliability
You’re designing functional components. Knowing they’ll meet spec the first time is critical, especially when testing in assemblies, sealing surfaces, or mechanical interfaces.
✅ Risk Reduction
Relying on “typical” tolerances can result in parts that don’t fit, leading to rework, missed deadlines, or failed tests. We eliminate that guesswork.
✅ Faster Validation
With guaranteed tolerances, there’s less back-and-forth, resulting in:
- Fewer failed prints
- Faster approvals
- Faster go-to-market
Proof in Action: Real-World Use Case – Mission-Critical Fit
One of our automotive clients required nylon components with precise mating features for a critical assembly. The specification was tight: ±0.25 mm across an assembly spanning 250 mm. Instead of rolling the dice on typical tolerances, they worked with us to:
- Define and lock down critical features
- Adjust designs where needed
- Build sacrificial parts to dial in the machine parameters
- Achieve guaranteed results on the first build
The Outcome? Parts that passed QA with no modification, and a test cycle to launch a full week ahead of schedule.
The Bottom Line
In high-performance engineering, “close enough” simply isn’t good enough.
Typical tolerances leave you guessing. Graphite’s guaranteed tolerances give you control.
For detailed guidance on tolerances for our range of 3D printing technologies download our Accuracy Guidelines!
Ready to eliminate uncertainty in your next project?
Let’s define your requirements upfront and deliver with confidence.
