My printer started doing something very very strange: when slicing with Simplify the hotend temp readings go all over the place. The temperature does not vary like that in reality, jumping from 210 to 164 to 257, as the print looks perfect. The problem is these strange readings sometimes jump over the maximum accepted one triggering the printer to stop extruding.
This is a recent thing with Simplify and it does not happen when I slice with Cura.
One thing I noticed is when printing a Cura sliced object the led for the hotend blinks rapidly keeping the temp variations within ±3°, like when I’m not printing and I just raise the temp.
Is there a setting in Simplify that overrides the PID settings (I looked, but didn’t find any)
I’ve not seen different temperature behavior with different slicers. What is your controller board and firmware?
Ramps with repetier. This, however, has no impact as I see different behaviours only when I slice with Simplify3D.
My guess is there is something wrong with the printer, it’s just that other software is not reporting it fast enough. When idle, printers don’t normally emit the temperature, they are responding to an M105 command from the software. The frequency of that command could simply be different.
There is nothing in Simplify3D that would change the temperature that quickly, so my guess is that you might have a loose connection at your hotend.
Most likely there is a break in the wire from the thermistor or it is loose at hot end
@William_Steele
@Roger_Tee
As you can imagine, he wiring is the first thing I looked at. even changed the thermistor with all the wiring and connected it to a different pin, the same for the hot end - new and connected to the other available slot.
IF it would behave the same way when slicing with Cura, I’d look more into the hardware.but it does not. went through a PID calibration and now the temp variations are even lower at +/- 1.8. As soon as I bring gcode made with Simplify, variations are again wild. but they are only “read” that way as the real temp does not vary! to get around the issue I’ve just increased the max temp at which the printer is turned off to about 275 and prints look superb - as they do when slicing with Simplify - that’s why I’m more and more convinced it’s on the software side of things.
I’ll continue debugging, even if it drives my wife crazy, but thanks for the input.
There is a setting on how often the software reads the thermistor try making it reading less often
Check your start script in simplify. Also check the start of the gcode see if there is any m codes that could be changing the settings in your eeprom. Learning to read basic gcode can be so handy when debugging a problem like this.
Also I didn’t see if you stated the host you are using
@Daniel_Fielding always running off the SD card.
@Daniel_Fielding Did it, nothing any different, especially since i have the same Start/End gcode. These are things I’ve studied at uni - no problems there.
@Roger_Tee hmmm I found this setting that “overrides” the printer ones in the process settings for Simplify, in the gcode tab and the baud rate was 112500 instead of 250000, as is in the firmware. I’ve unchecked the box, as there’s no need for it and it looks like it’s all good.
thanks for reminding me that refresh speeds tend to like being the same :))