I don't know exactly the bug of CS8420. I just heard someone said 8420 has bug when upsampling.
What I want to know is CDM12 which you said there is problem with the laser head. Furthermore, I am also anxious to know the detail of your pet "CRAZYMAT " version since I have missed that class in March.
Can someone already has this CDM12 ( HIFIDIY version ) modified give some comments ?