@Phaedrux
That works indeed! Thanks.

Hi,

I am working on a 1x1x1 meter FGF (pellet extruder) printer. The extruder exists out of 3 x 500 watt heating zones at the bottom of the extruder and a water cooled hopper at the top of the extruder.

The water cooling is there to prevent the pellets from melting / fusing before they enter the extruder chamber.

Right now I have configure the water cooler as a PWN Fan with thermostatic control. The problem here is that the fan always runs at 50% which is too much to heep a specific temperature. What I want is to configure this water pump as an inverted heater. It only has to run a few seconds every minute to keep the temperature at the desired set point.

If I configure the pump as heater using a !-mark I get an error because the system thinks the heater is heating so slowly.

What would be the best way to configure such a configuration?

Thanks