Ramps 1.4, wrong indication of temperature of the extruder.
My Ramps has a strange behavior. I set the extruder temperature to 230 ° C and the temperature stabilizes at 235ºC. What can be wrong? The hardware is a Prusa Mendel + Ramps 1.4 + Arduino Mega 2560 + LCD Smart.
I appreciate any help.
Have you already tried autotune for pid control or switching to dead time control? It is a problem with extruder with high power which are easy to pull a bit higher then expected. Reduce power while controlling (pid drive max or even pid max). Reduce damping part D or increase proportional part P.