This is an official video but the settings are suggestions, so you may need to try it a bit.
Setting used are:
Stainless steel 1000 mm/m with an interval of 0.01 mm
2000 - 3000mm/m with interval of 0.02 / 0.03mm
for plastic 6000 mm/m and 0.03mm interval.
Now it is said that running at 100% may heat the diode too much, which wears it down. Not sure if that is also the case for the IR laser, but I would limit the power to 85% and slow the speed to resp 850, 1700, 2550 mm for the Stainless steel and 5100 for plastic.
I haven’t tried mine yet, but I was looking for some initial settings.
Have fun!