I have recently started to use PLA after having used ABS for a long time. When the cooling fan is running with more than 25% speed, the extrusion nozzle temperature will drop from 185° C to 165° C. At 165 degrees, the filament is not melting, and the extrusion gets stuck.
I hit the pause button and manually lower (or shut off) the fan, and immediately the temperature rises again, and I can continue the print. However the cooling of the printed layers is quite bad.
The temperature control works fine, but to me the power in the nozzle seems to be weak. There is really no problem to to reach high temperatures in “still” air (245°C). The fan is attached to a manifold (that I printed a long time ago) with 3 outlet blowing holes. I cannot remember having issues with manifold before, but I might be wrong. Perhaps the cooling is too efficient.
Is there someone who can tell me if it is normal that the nozzle temperature is so sensitive to flowing air. I can of course reduce the air speed, or move the fan away from the nozzle, but resulting in bad printing quality.
Does the nozzle heater “die gradually” over time. I don’t seem to have any hot (burned) spots on the connectors or pcb. I think that any voltage drop here should show as hot spots.
Any good suggestions?