I work for an orthodontist using Form 2 to print models of teeth. For several months we have been successfully printing models but in the last 3 days all prints have cavities and visible layers on them. As far as I know the resin tank has not been changed in the last three days. One of the staff members tried cleaning the unit yesterday but it make no difference.
The following photos are all identical models.
Previously printed model:
Example 1 of faulty printing today: