I have been having a problem where my K1 Max is not extruding any filament for the 1st second of the print. The filament seems to have a 1 - 2 second pause before extruding at the start of a print. This then prints fine and no issues regarding extrusion after the first few seconds. Obviously when it then goes back over the first part on the second layer, the print then absolutely fails because the first part of the print had not been laid down at all.
As an interim I have enabled a brim around the print and can see that it does not seem to extrude straight away. Luckily the brim seems to resolve the issue but I was looking to see if anyone else had the same issue when starting a print on a CFS Upgraded K1 Max.