Laser leaving burr in hole

[timemmons]

Hey,
Hoping someone can help me with this. When cutting circles on our Mits LVPlusII 3015 laser, it is leaving a burr in the area where the beam ends its cut inside of circles. I am attaching some pix to give you an idea of what I am talking about. Let me know if anymore info is needed and I'll gladly supply. Thanks in advance for your help.

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[herby08]

try to change the focal distance
greetings
waltfl