My high school recently opened a FabLab that includes an Epilog Mini 45W. I have been using it and incorporating it into my Engineering and Physics class since it opened. I designed and started making some puzzle maps of the city I teach in. When I went to cut 5 on one 2' x 1' sheet of 1/4 baltic birch ply, I noticed that there were many random spots where the laser did not go all the way through. I had to end up cutting them out with a scroll saw. I even went to a slower setting and it still did not go through. I do not think it is a level problem as they are randomly scattered throughout. The only thing I can think of is the nonuniformity of the plywood, and the fact that it was already close to the limit that my Epilog machine could cut through. Wondering if anyone else has any suggestions. I attached a picture of one of the non cut pieces.
thanks.