Print problems and fixes

[dc42]

@chriskimbr said in Print problems and fixes:

I got a thermistor from Local store, no paperwork, he said it was standard 100k thermistor.

If it's a standard Chinese thermistor then this line won't give accurate temperatures:

M305 P1 R4700 T100000 B4388 ; set E0 thermistor parameters

Try changing the B parameter to B3950. This still won't be very accurate, but it will give the same results as Marlin temperature table 11, which is what most 8-bit controllers use with this type of thermistor.

[chas2706]

Hi, I have same printer. I notice your stepper currents are set at 800. If you original steppers from tronxy they have maximum current rating of 1.68 so yours should be set at 85% which is just over 1.4.

[dc42]

@chas2706 said in Print problems and fixes:

Hi, I have same printer. I notice your stepper currents are set at 800. If you original steppers from tronxy they have maximum current rating of 1.68 so yours should be set at 85% which is just over 1.4.

I don't know that printer, but if the motors are attached to plastic parts then you may find that at 1.4A the motors get hot enough to soften the plastic. I find that 1.68A motors run well enough at 1.0A or 1.2A in my printers.

[chas2706]

Thank you for that dc42. I shall reduce mine.
By the way, this board is the bee's knees and your commitment to it and the forum are outstanding.

[chriskimbr]

@dc42 Sorry forum won't let me uncomment this line says its spam.

Ive been using this line ...
M305 P1 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1

Do i need the C7.060000e-8 value?
I got this from someone elses config and am not sure if i need it or what to set mine at.

[antlestxp]

have you checked that all of you axis are going the proper distances (step per mm). you can check by jogging the tool head along a ruler so you don't have to run a print.

[chriskimbr]

@phaedrux

I ran this command to do the PID test.
M303 H1 S240
What does this mean? what to do next?

[Phaedrux]

https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control

After running the tuning M500 will save the results to config-override.g and then you must add M501 to config.g to load config-override.g at startup.

[NicoLab28]

check relative extruder, you never know

[DocTrucker]

@nicolab28 said in Print problems and fixes:

check relative extruder, you never know

Certainly check extruder e-steps but absolute or relative extrusion doesn't have that much effect.

[NicoLab28]

On one of my printer, the nozzle closes continuously, and checking this box, no more worries.
He has an M83, and S3D gives him an absolute gcode

[chriskimbr]

@dc42 I stuck a ruler and moved x, y , z. spot on.

[chriskimbr]

@phaedrux Is this where are you seeing 80mm/s base speed?
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E96.00 ;steps per mm

Whats the difference, Don't they both set the microstepping speed? does one override the other? what is the correct speed to have with my issues?

[Phaedrux]

@chriskimbr said in Print problems and fixes:

@phaedrux Is this where are you seeing 80mm/s base speed?
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E96.00 ;steps per mm

Whats the difference, Don't they both set the microstepping speed? does one override the other? what is the correct speed to have with my issues?

No I got it from your screen shot from S3D here:

4800mm/min = 80mm/s

[chriskimbr]

@phaedrux said in Print problems and fixes:

M500

Where in the config.g file do i put the M501 ?
Any parameters after the M501...?

[Phaedrux]

@chriskimbr M501 should go at the end.

https://duet3d.dozuki.com/Wiki/Gcode#Section_M500_Store_parameters

[dc42]

@chriskimbr said in Print problems and fixes:

@dc42 Sorry forum won't let me uncomment this line says its spam.

Ive been using this line ...
M305 P1 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1

Do i need the C7.060000e-8 value?
I got this from someone elses config and am not sure if i need it or what to set mine at.

Those settings look to me like settings intended for the 104GT2 thermistor used in E3D hot ends, but they are not correct even for that one.

[chriskimbr]

@dc42 so what should i do?

[Phaedrux]

Given the low cost of a new thermistor with known values, I would probably just go that way and get a genuine Semitek from E3D.

[chriskimbr]

@phaedrux I installed a
Genuine E3D V6 All-Metal HotEnd 1.75mm Universal w/Bowden Full Kit - 24V (V6-175-B-24V)
https://www.amazon.com/dp/B07FJW9343/ref=cm_sw_em_r_mt_dp_U_2-YHCb7H4J2RD

$74 instead of $11 for the clone. Ouch!

However, the duet is still reporting 20degress more than actual temperature.
I checked it with Multimeter temp thermistor.

What do I need to change in the m305 line above?
Anything else?