First layer perfect, later nothing sticks
I have Prusa MK4 since July 2023 and I print a lot (~ several hours per day).
Recently I have encountered some issues. The first layer is perfect, but when the speed increases, filament doesn't stick and everything is torn. What can cause these troubles? How to fix this?
I did check everything in Calibration and nothing was detected to malfunction.
Rods are properly greased, the bed is clean, no debris anywhere (I also used compressed air), belt tension is ok, all temperatures are right during the print. I tried different filaments, also Prusament. I have the newest firmware 6.4.0 and software - Prusa Slicer 2.9.4. I use default settings (with just slight changes like: brim, other infill etc.). I changed Nextruder, did several cold pulls, tried slower speed, tried to print different models.
