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Duet 0.6 Bed temperature is too low.

Posted by Treito 
Duet 0.6 Bed temperature is too low.
December 24, 2017 11:47AM
Hello,

the readings are far too low. I have a nearly constant offset of 17°C. How can I fix the readings? I tried the H and L values but this is not working properly.
The problem is the setup. Silicone heater with integrated Thermistor, aluminium plate (8mm and a diameter of 220mm).

Merry Christmas,

Sven


Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.
Re: Duet 0.6 Bed temperature is too low.
December 24, 2017 12:04PM
What M305 parameters are you using for the bed thermistor?


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Duet 0.6 Bed temperature is too low.
December 25, 2017 12:34AM
Duet 0.6 from China? They used to have a different resistor in line. 47k (T47000 ) instead of T100000.
Re: Duet 0.6 Bed temperature is too low.
December 25, 2017 03:11AM
M305 P0 T100000 B3950 H-5 R1000 ; Set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4725 C7.06e-8 R1000 ; Set thermistor + ADC parameters for heater 1


Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.
Re: Duet 0.6 Bed temperature is too low.
December 25, 2017 05:56AM
Your M305 settings look OK to me. However, 17C indicates that the ADC has quite a large error, and you will need a larger H parameter to correct it. Try H-30.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Duet 0.6 Bed temperature is too low.
December 27, 2017 06:00AM
That changes the temperature only by 3°C.


Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.
Re: Duet 0.6 Bed temperature is too low.
December 27, 2017 10:07AM
Quote
o_lampe
Duet 0.6 from China? They used to have a different resistor in line. 47k (T47000 ) instead of T100000.

Did you try that too?
Re: Duet 0.6 Bed temperature is too low.
December 28, 2017 06:01AM
That is not the problem as the room temperature is shown normally.

However the Thermistor position is far away from the upside. It is integrated in the silicone heater. 8mm Aluminium with a diameter of 220mm and on top is a FilaPrint.
I simply need to add 17 to the temperature shown, but how?

BTW the heater cartridge is working well.


Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.
Re: Duet 0.6 Bed temperature is too low.
December 29, 2017 12:40AM
The difference in temp reading is much lower at room temp and can be adjusted with the H-parameter. But it will grow at higher temps. The adjustment for higher temps is done with the B-parameter. Although B3950 is a typical value for a standard 100k thermistor, it might be good to measure the thermistor resistance at room temp ( 20°C~130k; 25°C~100k )
Re: Duet 0.6 Bed temperature is too low.
December 29, 2017 02:10AM
80°C means 63°C in real.
120°C reading means 103°C in real.
135°C reading means 117°C in real.

The issue is most probably caused by the position of the Thermistor as it is far away from the surface.
Both of my cores will be equipped with a Thermistor screwed into the aluminium plate but unfortunately this is not possible for my Delta.


Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.
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