Free working Cetus MK3 - Thermistor cap!!!

supset

@dc42 The previous heat creep was due to the fan being off - ( M107 command in the print G code )

that has been corrected and is always on, now it just plateaus at 305c

supset

@dc42 The fans are focused on the heat sink, and far enough from the heater block - we are still 140c off Mark,...

@dc42 can you confirm reprap and the duet 3D 2 Wi-Fi board can reach 450c - if so, I may have a defective heater cartridge, can a heater cartridge partially work? what do you think?

supset

@bearer 290 C has maintain temperature accuracy, but I will try the 305C, to see if it stays active, if that’s what you mean, I will test

It just seems to plateau, it simply won’t go any higher, weird it’s a 50 W heater cartridge by slice engineering combined with the 450 C thermistor and the mosquito magnum so it should reach the 450 C temperature - unless the firmware or the duet 3-D 2 Wi-Fi board can’t handle it

I’m running 24 V 300 W power supply

@supset said in Free working Cetus MK3 - Thermistor cap!!!:

It just seems to plateau, it simply won’t go any higher

and if the LED stays on then you're either got an underpowered cartridge or just loosing as much heat as you can add.

if the LED goes out the duet is limiting the power to the heater and its a config/sensor/gremlin issue.

depending on that we can start focusing on narrowing it down

So I just tried attaching a pot to E0 and copied your config. Set the pot to 750-ish oms which should be about 300C

turned the resistance down until I got about 450C and it measures about 144 ohm

so the sensor config and spec sheet seems to working correctly on duet2wifi with rrf 3.1.1


M308 S1 P"e0temp" Y"thermistor" T500000 B4723 C1.19622e-7 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                                      ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                                          ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S445                                              ; set temperature limit for heater to 445C
M563 P0 D0 H1 F0

dc42

Is it definitely a 50W heater cartridge? Measure its resistance to check.

Phaedrux

Is your power supply keeping up? What are you getting at the VIN terminals when trying to reach temp?

supset

@bearer LED? On the motherboard?

sensor - you mean the heater cartridge?

@supset said in Free working Cetus MK3 - Thermistor cap!!!:

@bearer LED? On the motherboard?

yeah ref https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_LED_indications

supset

@bearer said in Free working Cetus MK3 - Thermistor cap!!!:

“a pot”? Where did you turn down the ohm, is this a file configuration

supset

@bearer i’m relatively new at this, learning quite quickly, thanks for your help, we’re almost there I think, copying your config Code will work?

“a pot”? Where did you turn down hms, is this a file configuration

don't worry too much about the details, but I used a variable resistor (aka potentiometer, shorted to pot) to mimic your sensor on order to see if the the firmware would map the resistance to a temperature according to the google sheet you linked to - and it did.

copying your config Code will work?

it should be the same config i copied from your other thread, I just tried to verify that it was correct to rule out some factors.

please try heating it up again and take a look at the LED for the E0 heater down in the corner of the board and see how it behaves when leading up to the temperature plateau; also as Phaedrux points out, keep an eye on the Vin reading in DuetWebControl as the printer goes from idle, to heating and to settling on the plateau.and see if it changes much.