Printer very loud while printing

yagodajm

I just got a Duet 2 Maestro about 2 weeks ago and have being getting this up and running on my DIY printer. I am having a few issue up to and including printing, but my prints come out great. My first problem is when my hot end is heating up, I get a fault that the temperature excursion exceed 15.0C, my hot end fan comes on at 45.0C, but I hot end really over shoots the target temp, I have tried everything in the code and nothing seems to work. The second thing is that my after my bed mesh completes and the printer starts to print, the hot end is still too close to the print bed. I have to baby step every print. The third thing is my printer is crazy loud during printing, I am at a loss on how to fix it. any help would be greatly appreciated.

thanks,
Justin

0_1560473979531_config.g

antlestxp

Are you running a 12v or 24v power supply? 12v can cause motor noise even with interpolation set on the drivers. For temp issues, make sure you have the correct thermister picked in your config and also PID tune. It doesn't hurt to PID tune a couple times. For the z height, if you are baby stepping the same amount every time you just need adjust your z offset (you have 2.5 set in your config). If you have to adjust it to a different value each time then you might have a mechanical issue or you are homing to fast for your sensor. I hope some of this was helpful.

yagodajm

I am running a 12v power supply, I do have a 24v, I will hook it up in the morning and see if it make a difference. If I do go with the 24V does the duet output 24v to the hotend and heated bed? I just wanted to see if I have to change the leads on my heated bed and if most hot ends can handle 24v? I will also check the thermistor and PID to make sure they are correct. I will look at my baby stepping, it is pretty close to the same amount every time. I am running a 20mm test cube and it always comes out the same size and very clean.

Veti

first of your thermistor values are more likely not the ones for your printer
the beta value of 4138 is the default. this needs to be replaces with the values for the types used by your printer.

enable stealthchop at higher speeds for all but the extruder drive using the v parameter. adjust for your speed
https://duet3d.dozuki.com/Wiki/Gcode#Section_M569_Set_motor_driver_direction_enable_polarity_and_step_pulse_timing

your motor currents are also at their default value. is that 85% of their rated current?

Veti

@yagodajm
do not connect a 24v to 12v equipment. if you use 24v you have to use fans, hotbed, heater cartrige that is for 24v operation.

yagodajm

@veti

Ok, here are the specs on my steppers, Specification
Model: 42SHD0001-24 Step Angle: 1.8° Number Of Phase :2 Insulation Resistance : 100MΩmin.(500V DC) Insulation Class : Class B Rotor Inertia : 38g.cm^2 Mass : 0.2kg Rated Voltage : 12V Rated Current : 0.4A Resistance Per Phase : 30Ω±10% Inductance Per Phase: 37mH±20% Holding Torque : 260mN.m Detent Torque : 12mN.m, I am trying to figure out the current rating.

My thermistors are NTC 3950 100K Thermistor, so I am guessing that my model coefficient is 3950, correct?

I am confussed on hot to enable the stealthchop, this is my first time using the "M"commands, how do i add the Dnn or change the value. I don't see this anywhere in my code right now.

Also, thank you for the info on the 24v, i will give these adjustment a go, before I switch everything over.

Veti

@yagodajm said in Printer very loud while printing:

Model: 42SHD0001-24 Step Angle: 1.8° Number Of Phase :2 Insulation Resistance : 100MΩmin.(500V DC) Insulation Class : Class B Rotor Inertia : 38g.cm^2 Mass : 0.2kg Rated Voltage : 12V Rated Current : 0.4A Resistance Per Phase : 30Ω±10% Inductance Per Phase: 37mH±20% Holding Torque : 260mN.m Detent Torque : 12mN.m, I am trying to figure out the current rating.

see
https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors

Avoid motors with rated voltage (or product of rated current and phase resistance) > 4V or inductance > 4mH.

NTC 3950 are a bit of a problem. the B3950 is only valid for the range 25-50C. And they tend to vary by a lot at the higher temperatures.
Do you have a temperature table for that thermistor?

for stealthchop2 you do this for every motor (The V value is specific to your settings, see the documentation i posted above.)
you add that as a new line in your config.g
M569 P0 V30 ; Stealthchop2 till about 150 mm/sec

yagodajm

So I was able to get the NTC 3950 calibrated, so that I don't get the fault anymore. I will look for a better thermistor to use in the future. Here is the temp table for that thermistor, link text.

Thank you for the stealthchop2 settings, my steppers are dead silent now.

Veti

@yagodajm said in Printer very loud while printing:

Here is the temp table for that thermistor, link text.

is that for the exact thermistor you have or one you found on the internet?