sleep and thermal runaway error  

Re: sleep and thermal runaway error

Print from SD card, disconnected from USB causes the same issue nearly at the same point 🙁
The message "sleep..." is not shown, at this place stays the gcode filename.

Re: sleep and thermal runaway error

Jens

There is a discussion on the same topic going on here: http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/thermal-runaway-with-3-0-6--t1411.html

Basically it seems that the fan is being turned on too soon and ideally you need to reduce the fan speed.

Peter

Re: sleep and thermal runaway error

Peter

thx for your response.

As I wrote, Cooling is switched on from Layer 4.

Re: sleep and thermal runaway error

Layer 4 or 0.4mm?

Looks like the fan is working in the picture and the layer height is 0.4mm.

Do you have the same problem when you print one of the pre-sliced GCodes on the SD card?

Peter

Re: sleep and thermal runaway error

Peter,

Maybe its 0.1mm layer height?

Jens,

What material are you printing at 255 degrees that needs a layer fan?

Re: sleep and thermal runaway error

Richard

Brilliant; didn't notice that...

Can't be 0.1mm layers; first layer is (with current and most firmwares) set at 0.2mm. I suppose it could be 0.05mm layers, but not looking at the prints.

Peter

Re: sleep and thermal runaway error

First I would like to praise this forum. Fast and competent responses without blaming, very nice. Thanks!

As I wrote the error occurs in approximately 50% of the layer 2. The layer height is set to 0.2, so the height is 0.4.

You are right Peter, in the picture is nothing to see from a standing fan. Maybe it's just the light but I'm not quite sure the fan was not running.
The settings are disable fan for first 3 layers, so it should start at 0.8mm. I think it was off but I will repeat this print to be sure.

Richard, it's ABS. I switch the fan on because the large support structures which you can see rudimentary in the smaller parts. These structures are about 25 mm high and I can hold something thinner with fan, so they are easier to remove.

Peter, good point with the delivered gcode files, I will try the treefrog this evening.
I have the impression that it is up to the printing time, since I can finish smaller prints, for example a small calibration cube of 20mm.
The frog needs a bit more of 2 hours time und should not work. I'm curious...

Re: sleep and thermal runaway error

Jens

I don't think you will be able to use the part cooling fan with ABS without killing the heater.

Have you tried a lower temp setting without the part fan? The Prusa ABS that I have specifies a printing temperature of 200 to 230 degrees.

There is a problem in that cooling ABS induces warping and other unwanted side-effects.

Peter

Re: sleep and thermal runaway error

Treefrog printed. No problems, nice result 😀

I assume that the PSU reaches its performance limits due to the temperatures defined by me.
If during print a disturbance like turning on the fan occurs that requires a stabilization of both temperatures, the power is not enough ending in Thermal runaway. It is likely seen electrically the Heatbed play a much greater role than the Hotend I think which should be measurable.
I'll run a measurement protocol at the output of Hotend and Heatbed on occasion.

With my other printer I had initially also deal with such problems. Now I use there a 24V cartridge heater behind a 400W PSU. No more problems since.

The filament I used has very good mechanical properties but a relatively unfavorable flow. You can see that in the pictures. Therefore, the high temperatures. If I reduce it, which goes down to 235 degrees, I have to slow down the speed dramatically.

I will deal with the Prusa filament. The delivered parts have an excellent quality and I assume that I can get it in the shop.
btw, anyone knows if the orange parts from the Safety Orange filament are as I suspect?

Re: sleep and thermal runaway error

Jens

The PSU has plenty of overhead to cope with all heaters, fans and motors running flat out.

What I think you are experiencing is possibly an under powered heater cartridge for what you are attempting to do.

Generally with this printer, the part fan would not be used with temperatures in excess of 215 degrees. The 30W heater cartridges tend to generate slightly less (24 to 27W). It may be that you should either increase the PSU output voltage by 1 Volt or so or replace the 30W heater cartridge with one rated at 40 Watts.

Peter