Right extruder can't pass 235 degrees celsius

Vertex 3D Printer Vertex - Issues while printing
1

Hi.
My right (original) extruder can’t go up higer than 235 degrees celsius.

(This was my very first attempt to print with ABS).
The loading of the filament went well, and the temp was at 245.
But when printing, it would never go above 235.
I even lowered the fan from 65 downto 25, but it did’nt help.

I switched the filament from right to left, and tried again. This time it prints (as I write) at 245 degrees.

The termistors are both around 96-100 k @ 20 degrees.

What could I possible do to solve this ?

edit: The layers easily separated from each other, and never bonded with each other.

//C

2

Just a guess.
Did you check the screws that hold the wires for the heater block and thermistor for that nozzle?

3

Anyway you don’t need to print at 245°. 220-225° is enough.