Bottom line: annealing raises crystallinity and heat resistance, but it also causes shrinkage and warping. Control the ramp rate, hold time, constraint and cooling rate, then re-measure critical dimensions. Annealing cannot compensate for weak layer bonding from the original print.
Typical windows
| Material | Temperature | Hold | Main risk |
|---|---|---|---|
| PLA | 60–70 °C | 1–4 h | softening |
| PETG | 65–80 °C | 2–6 h | shrinkage, dull surface |
| ABS / ASA | 80–100 °C | 2–6 h | warping, delamination |
| PC | 90–120 °C | 2–8 h | moisture blisters |
| PA | 80–120 °C | 2–8 h | oxidation, yellowing |
Process steps
- Confirm temperature and time from the TDS.
- Ramp slowly.
- Constrain the part if dimensions matter.
- Cool slowly.
- Re-measure dimensions and strength.
Costly mistakes
- Placing the part into a preheated oven.
- Opening the door to cool quickly.
- No constraint or shrinkage allowance.
- Annealing wet material.
- Skipping post-anneal measurement.
Buyer / engineer checklist
- Is the material window confirmed?
- Are ramp and cooling controlled?
- Is constraint or allowance defined?
- Was the part dried first?
- Have dimensions been re-measured?
Tell us the material and part size and we can help define the annealing approach.Process advice