Heat bed thermistor leads detached from bed ?
I received my kit one week ago, assembled, calibrated and printed several models since then. This morning, while loading filament for the day's first print, I noted that the bed was heating very very slowly, and I eventually received a preheat error, with max bed temp about 34C. Quick examination revealed that the two small wires running to the center of the underside of the bed were no longer connected to the bed. Is this something I can (fairly easily) repair? Or is this going to require replacement part(s)?
I haven't done any disassembly yet, but examining the ends of the wires, I don't see any solder remnants, but what may be some sort of adhesive.
I've been very pleased with the printer and it's performance thus far, but this failure is disappointing.
Skysensor
Re: Heat bed thermistor leads detached from bed ?
I read 3 other posts mentioning this exact kind of failing.
I am still waiting for my own kit but that makes me think that it might be a good idea to apply a dab of epoxy glue on the thermistor leads when putting the machine together.
From the other posts, it seems that most users managed to slide the thermistor back under the tape but maybe someone who actually did it could give you some more practical advice.
If you manage to put the thermistor back in its place, I assume that some epoxy (even high-temp epoxy) might do the job in securing it once and for all.
Fosk.
Re: Heat bed thermistor leads detached from bed ?
I very carefully removed the bed from the frame, and peeled back the tape and reset the thermistor, after pulling quite a bit of wire back out of the electronics case. I can only assume that the motion of the Y carriage actually walks the leads away from the bed over time, eventually pulling them out from under the tape.
Seems to be working again. Bonus is that before this operation, the printer was "...slightly skewed. Good job", but now "axes perpendicular. Congratulations" upon recalibration.
Re: Heat bed thermistor leads detached from bed ?
I did the same thing mark did but I wrapped the heatbed sensor cable around the bed heater cable. This has helped keep the cable from working itself loose again from teh y-axis motion.
I also marked the sensor wire with a silver pen at the edge of the bed so I can quickly check and see if the cable has started to move after a long print.
-Jim
Re: Heat bed thermistor leads detached from bed ?
Same thing happened to me. I just assembled my machine and started using it two days ago. I noticed the heated bed temperature went up but the LCD showed room temperature. So I knew there's something wrong with the heated bed thermistor. Apparently, the sensor pulled all the way off the heated bed...So I put the sensor back to the right location and use lots of Kapton tape to tape down every inch of the cable...Not sure how long it will last...Perhaps this is an issue for this batch...I hope there's a better long term solution for this.