Prusia i3 thermister

[KingNyx]

I am using merlin for my prusia i3 pro printer. I bought it during your sale and I need to know which number to use for the configuration of the thermistor. Since the "manual" only says 100k ntc.

Thank you.

[zhangxueyou]

Hi, KingNyx
Do you mean which value is corresponding to thermistor in Marlin firmware? If so, it is in file" configuration.h":
"
//=============================Thermal Settings ============================
//===========================================================================
//
//--NORMAL IS 4.7kohm PULLUP!-- 1kohm pullup can be used on hotend sensor, using correct resistor and table
//
//// Temperature sensor settings:
// -2 is thermocouple with MAX6675 (only for sensor 0)
// -1 is thermocouple with AD595
// 0 is not used
// 1 is 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
// 2 is 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
......
#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 1
"
TEMP_SENSOR_0 is extruder thermistor.
TEMP_SENSOR_BED is hot bed thermistor.
We use only 2 thermistors (extruder and hot bed), so the values of TEMP_SENSOR_1 and TEMP_SENSOR_2 are 0.

[KingNyx]

Yes I know what you mean, sensor one and 2 are empty. But my hot bed doesn't seem to work with any of the choices. I always get the error "maxtemp bed" so I want to know both what thermistor is in the mk8 extruder, and the mk2a hotbed that came with the printer kit. Since the only thing I know is that the hotbed is a 100k ntc thermistor.

[KingNyx]

I understand what you mean here, but I need to know the thermistor selection for both my hotbed (mka2) and my extruder (mk8) Because currently my temp for the hotbed says 358 and sets off a "maxtemp bed" error. So obviously "1" isn't the correct selection. But the manual only species it as a 100k ntc. Nothing more.

[zhangxueyou]

The reason that the LCD says "358" is the 2 pins on board for connecting thermistor is short, which equals a wire connects these 2 pins.

[KingNyx]

For some reason it never occurred to me to check how the thermistor had been attached to the heating bed. the wire was wrapped together all the way up. It works now. Thanks a TON!!!