How to Fix Poor Dimensional Accuracy
Step-by-step fix for poor dimensional accuracy on Bambu Lab printers including X1C, H2D, P1S, and A1.
How do I fix poor dimensional accuracy?
- 1
Calibrate flow rate by printing a single-wall cube. Measure wall thickness — if it's 0.46mm instead of 0.4mm, reduce flow ratio by that percentage.
Setting:
Flow ratio - 2
Enable Arachne wall generator in Quality settings. It adapts wall thickness to fill gaps perfectly, avoiding over/under-extrusion in thin areas.
Setting:
quality.wallGenerator - 3
Use finer layer heights (0.12mm) and slower speeds. Both reduce thermal expansion and mechanical overshoot that cause dimensional drift.
Pro tip: Select "High Print Resolution" above — it enables Arachne and finer layers for the tightest tolerances.
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