additivetools

AM Dimensional Accuracy Estimator

Expected XY and Z dimensional deviation by process, material class, and geometry type. Based on aggregated published accuracy data (Moylan et al., EOS, ASTM F3303).

Process & Material

Geometry & Size

Geometry Class
Part Size Class
mm

Expected Dimensional Deviation

Based on aggregated published data. Values are for a single part on a calibrated, production-qualified machine.

XY (in-plane)
Mean bias+0.05 mm
1σ scatter±0.08 mm
Design tolerance (±2σ)±0.16 mm
Relative0.32% of nominal
Z (build direction)
Mean bias+0.10 mm
1σ scatter±0.12 mm
Design tolerance (±2σ)±0.24 mm
Relative0.48% of nominal

Verdict

Achievable IT grade:IT8-IT9
Post-machining:Not required

Higher confidence — values based on multiple published accuracy studies and manufacturer datasets.

Process Notes

  • 01No process-specific warnings for this configuration. Verify against your machine calibration data.

Geometry Class Comparison

XY and Z design tolerance (±2σ) for each geometry class — current process and size class fixed.

GeometryXY biasXY ±2σZ biasZ ±2σIT grade
Bulkselected+0.05±0.16 mm+0.10±0.24 mmIT8-IT9
Thin-wall+0.05±0.26 mm+0.10±0.38 mmIT8-IT9
Tall+0.05±0.22 mm+0.10±0.34 mmIT8-IT9
Hollow+0.05±0.19 mm+0.10±0.29 mmIT8-IT9
Fine feature+0.05±0.29 mm+0.10±0.43 mmIT8-IT9

Sources

Sources