frntz

Thank you so much for your reply I've changed the rear fan which now is on when the nozzle is above 40°C !

Hello everyone, I notice that I cannot print on my Ultimaker 2+ two times in row, it will always failed the second print by either printing the first layer then failed or cannot ... each time I have to remove the filament which is always stuck between bowden tube and the isolator and wait 1 hour or so for the printer to cool down. Gr5 Moderator mentioned an underextrusion issue which falls in my case I guess: I notice that sometimes the rear fan is not working at the beginning of the first print and then is always one, is it the normal behaviour ? Should I buy a new fan ? Is someone has the same issue has myself and what can I do to fix this ? My Printer : UM2+ My Firmware : _3.3.3