Dimensional inaccuracy and shrinkage come from the polymer, temperature, cooling, nozzle, flow and CAD assumptions. Before correcting the model, measure whether the error is uniform, directional or time-dependent.
Classify the error
- Whole part too small
- Holes too small
- Warping
- Layer shift
- Change after cooling
Material and shrinkage
Each polymer shrinks differently. Large parts distort more and reinforced materials shrink directionally. Compare the datasheet with the real production geometry.
Calibrate the printer
- E-steps
- Flow
- XY dimensions
- Z height
- Temperature
Test the real geometry
Do not rely on a small cube. Measure the production part after cooling and after any heat treatment. Record the result before changing CAD or slicer compensation.
| Cause | Symptom | Control | Action |
|---|---|---|---|
| Shrinkage | Part too small | Material | Scale or material change |
| Hole size | Holes too tight | CAD | Compensation |
| Warping | Corners lift | Chamber | Temperature |
| Flow | Dimensional error | Wall thickness | Calibration |
| Cooling | Change over time | Measurement | Slow cooling |
Common engineering mistakes
- Correcting from one measurement.
- Changing CAD first.
- Measuring before cooling.
- Ignoring the material.
- Testing only a cube.
Checklist
- Which error type is present?
- Is material shrinkage known?
- Are E-steps and flow calibrated?
- Was the part measured after cooling?
- Was the real geometry tested?
Discuss dimensional accuracy through the quote form.