After several hours use, my GF seems has the problem of power reduction.
At the beginning, to cut a 3mm MDF, with speed 170, full power I got a clean cut.
but now the same material even with speed 140, full power, still fails to get a clean cut.
The left side area is ok (the MDF is 45cm x 30cm):
but the right side area isn’t cut through:
I’ve done all wipe for the lens and mirror, same result.
I also check the MDF board, it’s flat, not inclined.
Did I miss something or any suggestion?