Hello everybody,
We are having the same problem of unstable nozzle temperature. We bought our UM2 one month ago and it was printing very well until yesterday. Now without printing I try to heat up the nozzle and see if the temperature reaches the target temp or not, when set to 210 degrees it has a fluctuation of +-10 degrees. Please let me know how is the nozzle temperature control procedure in UM2, is the fan behind the nozzle used to control the temperature or the temperature is only controlled by the heating element?
Another question is that which fan are we setting in Cura, 2 side fans or the fan at the back of the nozzle?
Hope to hear good news about your printers!
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anon4321 16
Most fans of these type are DC brushless motors and as such are electronically commutated. The electronics usually have a stall detection mechanism that will detect when the fan is blocked and shut off power. Then it periodically pulses the motor to see if it spins.
So if you block the fan, it will momentarily shut off and try to restart in a second or two. If the tach signal isn't detected immediately (within 10s of milliseconds), they turn off the motor power and repeat.
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