This is a 60w model with the blue covers. It has worked fine for about a year, but now it acting very strange. The preview of a square shaped engrave pattern is suddenly an ellipse, and then results in the one center dot being way off the table after the preview. It did this yesterday, then seemed to be ok this morning for a few minutes before reverting back to not working. We are a high school engineering class, and could use help getting this working reliably again.
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