Head rubs occur when the print head comes into contact with the media while printing. There are two main causes
1. The table height is not set properly, causing the media to come into contact with the pint head. Recheck the height of the media and table to prevent a head rub or strike.
2. The heat from the lamp is causing the media to bow, and coming into the path of the head. On certain materials such as low melt plastics, a lower setting should be used. This can be adjusted by turning the knob on the chiller to a lower setting. Materials should be tested if warping may be a concern.