Free working Cetus MK3 - Thermistor cap!!!

dc42

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

I added a secondary duplicate fan to the heat break, because of massive heat creep all the way up to the Bondtech extruder melting the bottom mini plastic protrusion mounts - had to drill out the filament path all the way through the heat brake and heater block - three times - ( I know, WTF ) - in case this has any bearing On the matter!

The combination of not reaching 300C even with a 50W heater and having massive heat creep sounds like an incorrectly-assembled hot end. I don't know the Slice hot ends, however it's not uncommon for users of E3D V6 hot ends to assemble them with the heater block touching the heatsink, where there should be a gap of several mm. This leads to the "massive heat creep" you mentioned and an inability to reach operating temperature.

A Former User

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

reprap has no adjustable temperature limits

https://duet3d.dozuki.com/Wiki/Gcode#Section_M143_Maximum_heater_temperature

so having M143 H1 S450 in the config should help, but iirc you had this in a different thread, and looking at the curve it does flatten out like its reached its set point or highest temperature.

does the LED for E0 stay on all the time when its at 305C or does it start turning off before reaching 305C?

and do you have any other means of measuring the tempearure to determine if the thermistor is just giving you a bad reading?

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

A Former User

@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

A Former User

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?

A Former User

@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 Former User

“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.