Hi Evgeny

The Filament from GRRF have this issue ? that sounds not good, please contract the support bec of this Filament 2.2mm never seen this ( cant check at the moment bec not in munich ) 2.2 should be on the Limit the nozzle is a bit bigger but 2.2 could be too much and also the bowden will produce much mord force with 2.2mm.

about the fan thanks for information i'll put forrward this information to GRRF that they can check how this can happen.

About the fan good, with the connector on the printboard you can control it with the slicer

Best regards
Thomas