3D printing tolerance.
Per process.
Realistic expectations.
3D printing tolerance reference. Different processes hold different tolerances. Plan tolerance per process. Post-machining for tight tolerance.
Key principles.
±0.1 mm
SLA precision laser. Best 3D print tolerance.
±0.2 mm
Plastic powder fusion. Standard tolerance.
±0.3 mm
Filament deposition. Lower precision.
±0.2 mm
Metal powder fusion. Post-machining for tight tolerance.
±0.025 mm
CNC critical features achieves CNC tolerance.
XY vs Z
Z direction (between layers) typically 80-90% XY accuracy.
FAQ
Best 3D print tolerance?
SLA ±0.1 mm typical. Better with calibration. CNC machine for ±0.025 mm.
Why is Z direction worse?
Layer-to-layer adhesion vs in-plane. Z slightly larger tolerance.
Post-machining strategy?
3D print near-net + CNC critical features. Combines geometry + precision.
Specifying tolerance?
Realistic per process. ±0.2 mm on prints, ±0.025 mm on machined features.
Inspection?
First-article inspection per drawing. CMM for critical features.
Tolerance vs detail?
Detail (small features) better than tolerance often. SLA detail to 0.05 mm.
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