Generically speaking, our operators sometimes have issues:
1. material has rust. they usually will palm sand rust off for better results.
2. oxygen pressure too high (or low), especially in tight geometries, causing blowouts.
3. then you have the usual suspects like with everything else like focus, feedrate etc.
What exactly is your problem? Blow outs, hard dross, edge quality?
"I am stuck on Band-Aid brand, 'cause they are stuck on me"