Hi, how is temperature of the heatsink (the water reservoir) when the watercooling is running? If I heat up to 220°C I cannot touch the surface of the heatsink anymore. I think if I will do longer prints, my hotend holder will melt, even it is PETG. How do I check, if the pump is running right? The fan runs without any problems, but bubble in the tubes does'nt move, I think the pump is broken.