Temperature fluctuations

[azri @azk13 My Robox is a Blue Commercial Version]

So today i decided to monitor my temperature graphs. Seems like there are fluctuations that reduces your temperature to undesirable printing temperature if you do not set your temperature higher than the material melting point.

I don’t know if this is a software issue or if it is a hardware issue because the drops happen at the same point of the prints.

Anyone face similar trends?

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[click @click My Robox is a Green Kickstarter Limited Edition]

Is it same print you did? If so - same time?

Is it worth sharing gcode here so we can check if there is something in it?

Theoretically there might be some deliberate cooling down and heating up in the gcode. Anyway you can always search gcode text file for M104 followed by Sxxx value.

BTW I didn’t notice anything similar but didn’t really watch carefully.

[BHudson @bhudson My Robox is a Green Kickstarter Beta]

I have never seen that large a temperature fluctuation on any of my three Robox printers. I would guess either the thermocouple on the head is loose or there is a problem with your heater wiring or something else. That is a huge fluctuation for the head heater. The most variation I have ever seen in the head or the bed is +/- 2 degrees C during operation.

I am not affiliated with CEL; I operate two Betas and one Production Robox.

[smitty @smitty My Robox is a Blue Commercial Version]

@bhudson i had a funny temp drop yesterday after id updated a reel profile ,if noticed with am 1.01 that if you update a reel profile and then don’t quit am and reboot that iys liable to still read the old profile ,i had two prints drop temp drastically because the old print profile had the temp set at 60 instead of the temp id updated to 190 ,was only till quit am and restart did it recognise the new profile ,doh

smitty

[azri @azk13 My Robox is a Blue Commercial Version]

@clicky Its the same print

@bhudson Yeah 10 degrees drop is scary but I actually first set the temp at 190 it dropped to 183 then went up again then I set at 192, it still drops to 183 and went up again….Very consistent

[BHudson @bhudson My Robox is a Green Kickstarter Beta]

@azk13 I would open a support ticket. That still doesn’t sound good to me.

I am not affiliated with CEL; I operate two Betas and one Production Robox.

[azri @azk13 My Robox is a Blue Commercial Version]

@bhudson I am reprinting the same thing today to see if it happens again and will further investigate this.

[azri @azk13 My Robox is a Blue Commercial Version]

Ok so I monitored the print closely and the temperature drops when it is printing a certain part of the prinjob. I have attached a video and a picture.

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[click @click My Robox is a Green Kickstarter Limited Edition]

@azk13 Yes - it is clearly visible from avi file. It would be really interesting seeing what gcode is like for layer 12, 13 and 14! It almost looks like you have:

M104 S180 at the end of layer 13 and then in next layer

M104 S190

M109

at the beginning of layer 14…

Did you check? Alternatively - post gcode here and we’ll have a quick peek into it…

Since all other things are quite correct - rest of the time temperature is very closely kept to expected, I don’t immediately suspect hardware issue. Yes - definitively share gcode if you are allowed - 3d visualisation can give us some more clue what is happening with those layers. (and yes, I am promoting my gcode preview! O : )

 

[azri @azk13 My Robox is a Blue Commercial Version]

@clicky Sad to say, there is only one m104 and m140 which sets temperature to pre print nozzle temp and nozzle temp which happens at the start which rules out software issues.

[click @click My Robox is a Green Kickstarter Limited Edition]

@azk13 not yet. There’s firmware, too! There is (potentially) something in the print which can hint us to something else! (yes, I am clutching straws here).

Gcode could reveal something - but I’ll need to ask for apology if I pushed too far insisting to see it O: )

 

[azri @azk13 My Robox is a Blue Commercial Version]

@clicky I could let you have my g-code to check but I can’t put it here because its patented design. Could i mail you or something?

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