[cya_alex]

Hello guys, bought a new laser of ebay 130 w but it has a weird problem , as you se in the picture near the tube it makes kind of a big dot all the way to the cutting head it makes a dot in the middle and a big circle. after engraving for say 15 minute the dot disappears and only the circle remains and it gets to around 20mm in diameter at the 3rd mirror.
if i set it to higher power the laser cuts and the dot stays a dot, if i pulse the laser from the power source it makes a dot, if i pulse it from the control panel it makes the ring and especially at lower powers.
Anyone had this problem, any solutions or repairs for this. The tube is made in 16.03.2018 so it is new i had it a month now and tried everything i could think of as in:

Alignment of mirrors, clean lens, verified the laser tube it has no cracks i use a cw5200 chiller with glicol in it and distilled water. reset the controller and settings of the machine.

Any ideeas would be apreciated , Thank you