When using xTool F2 Ultra UV for glass inner engraving, the actual engraving position may be higher or lower than the position set in the software, as shown below.

• Higher than expected

• Lower than expected

Possible causes

1. Incorrect Z-axis offset
2. Incorrect Z-axis calibration parameters
3. Positioning errors caused by the glass's refractive index

Solution

1. Perform Z-axis calibration before starting the inner engraving. During calibration, make sure to enter the correct material thickness and Z-axis calibration parameters.

Note: If the Z-axis calibration parameters are updated, perform the inner engraving work area calibration again.

2. If the actual engraving position is still higher than expected after completing the Z-axis calibration correctly, perform Z-axis calibration again. Use the correct Z-axis value as the baseline, then subtract the distance by which the engraving is offset inside the glass. Example: If the correct Z-axis value is 20 mm and the engraving is 2 mm higher than expected, enter 18 mm.

Note: If the Z-axis calibration parameters are updated, perform the inner engraving work area calibration again.

3. If the actual engraving position is still lower than expected after completing the Z-axis calibration correctly, perform Z-axis calibration again. Use the correct Z-axis value as the baseline, then add the distance by which the engraving is offset inside the glass. Example: If the correct Z-axis value is 20 mm and the engraving is 2 mm lower than expected, enter 22 mm.

Note: If the Z-axis calibration parameters are updated, perform the inner engraving work area calibration again.