Fill out above information andin all cases attach yourklippy.logfile (use zip to compress it, if too big). Pasting yourprinter.cfgis not needed Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there
Describe your issue:
Hello, i am super new to 3d printers and just bought my first 3d printer from a friend so it is already modified. After i reinstalled klipper and got new printer motherboard i get the error of printbed not heating. Can anyone help and maybe explain it so someone with almost no knowledge (me) can fix it? I just want to print a benchy for start but can’t Thanks
Thank you everyone, i solved the issue, it was the wires. Tried to heat it with hair drier and sensor for temp worked fine but i had no voltage, turns out i did a bad connection when i replaced motherboard.
Hi Anej, sorry about your difficulty. I’m not familiar with your printer and still relatively new to 3D printing myself, but I wanted to see if I can spot anything in your log that points to the problem.
If you open your klippy log and search ‘not heating’ or something similar to locate the error you’re receiving, you can see in the lines around/leading to the error that the bed temperature pretty much isn’t changing. I’d expect this is likely an issue with your bed heater or thermistor(I think they’re often combined for beds, heater + thermistor) or the wiring to it.
You might be able to find more experienced help and direction if you can find a discord for your printer/printer brand, otherwise someone will likely stop by here that can give you better direction in narrowing the problem down further.
That error indicates that Klipper gave power to the heat bed and the temperature didn’t increase fast enough. Looking at the temperatures reported in your log, I’d guess there’s a wiring issue somewhere between your mainboard and the heated bed. I would verify the heat bed connections and make sure there isn’t a cable break somewhere between the mainboard and heated bed.
You should also make sure the thermistor is still physically attached to the bed. The red line in this picture shows where the thermistor wire typically is on an Ender 3 bed. Another way you could check is to reproduce the issue (letting Klipper try to heat for a minute before shutting down) and feeling the bed surface to tell if it heated a bit. If it got hotter, the thermistor isn’t properly reporting temperatures. If it stayed room temperature, the thermistor is reading right and the heater isn’t heating.
In this graph, the yellow line represents the actual bed temperature and the blue represents the target. After a minute or so after turning on the bed heater the temperature doesn’t change.
Broken bed heater wires on “bed slingers” are VERY common. Repairing them is easy enough but you’ll need a soldering iron of 60w+. You won’t get the solder to melt with a 20w pencil iron. Replacement beds come with the wires attached.
After you get it repaired or replaced look for “ender strain relief” At printables or thingverse.
If you have a multimeter, it might be worth checking to see if the bed heater pins on your board are actually outputting the correct voltage when you turn the bed on. That’ll narrow the problem down to either the bed itself, or the board or software.
Might also be worth checking the fuses on the board and/or bed, if there are any.
As others have said, the bed or the wires to it could be damaged, but if you do have a multimeter, I would confirm that this is the case before purchasing a replacement bed heater. Given that this error occurred after re-installing Klipper, it could very well be a mis-mapped pin, or something similar.
On the first read I failed to notice you recently replaced your mainboard. Is it possible you have the extruder heater (HE0) reversed with the bed heater?
Thanks
