Big problem with temperature control with ABS printing

[fritz99 0]

Hello !

At the start of printing the software heats the hotend to 260 degrees.

That is ok.

After start of printing the temperature lowers to 230 degrees.

And then it rises to 260 degrees again and stays there.

What is wrong ?

Fritz

[phanc60844 0]

Does the setpoint change or just the temperature? if the setpoint changes then its software, if the setpoint stays the same then there must be a problem with the heater/cabling/thermocouple

Paul