I'm new to this site but did start to use the firmware may years ago. Things change and I change the connected pc to newer. This after the system not has been used for many years. In this new start I have detected a problem, layer 3 and 4 are not donding on some part of the model. This problem is the same what ever layer hight or slicer program or if I change the printing speed. The first layers are looking perfect as the rest of the model. The bed level is within.0.1mm. My system is a delta printer with a pc laptop as controller.