Hotend Test Immediate Failure
I just put together this Core One model, everything went well when setting up, all tests passed up until the eighth test -- heating. Heatbed works fine and passes every time. Nozzle heat is evaluated as a failure almost as soon as the test starts. Manually increasing the nozzle heat creates the exact same result, causing a forced shutdown and gives error #31202. The error page is not very helpful IMO, but overall every connection on the nextruder and loveboard are correct and there is no apparent damage to any cables. Help on this would be greatly appreciated.
RE:
When you manually increased the nozzle temperature, did it get hot or stay cold? If it did get hot followed by a failure then perhaps the thermistor is bad. It's always a good idea to have spare hot end thermistors and heating elements. I use non-Prusa branded ones from Amazon that work fine.
If this is page you are referring to I think the instructions are pretty good: Hotend preheat error
RE: Hotend Test Immediate Failure
It really doesn't have enough time to heat before it forces a shutdown. Thermometer showed a 1 degree (fahrenheit) increase before it shut off. I can't imagine the thermister is bad, this is a brand new kit I got straight from Prusa. I could be wrong, but this is my first printer, still learning a lot of things.
RE:
It really doesn't have enough time to heat before it forces a shutdown. Thermometer showed a 1 degree (fahrenheit) increase before it shut off. I can't imagine the thermister is bad, this is a brand new kit I got straight from Prusa. I could be wrong, but this is my first printer, still learning a lot of things.
It's entirely possible it's a bad thermistor or bad thermistor cable, possibly the heating element (or both). It happens. I would suggest picking up this: Prusa Original MK4 XL Hot End Part, ask Prusa to send you a new on (or both). It never hurts to have a spare on-hand.
RE: Hotend Test Immediate Failure
Make sure you did not break one of the tiny wires on the sensor. Been there, did that, $50.
Extra HAM Radio - N4MCC
RE: Hotend Test Immediate Failure
I didn't finish. Make sure that when you disassemble the nextruder, you unplug everything. I made a mistake of "it is a small tweak," and the hotend assembly dropped and snapped one of the tiny wires on the nozzle sensor. That was the $50. No, you are not going to resolder one.
And as noted, don't crush the thermistor with the screws!
Extra HAM Radio - N4MCC
RE: Hotend Test Immediate Failure
@mac-n4mcc,
Out of curiosity, where are you buying the hotend thermistor that you are paying $50 for the part?! Printed Solid has them for $13.66 https://www.printedsolid.com/products/original-prusa-hotend-thermistor-xl-mk4?variant=40776193900629 and I guarantee that you can find several other sites offering them for the same price or less (note that these are U.S. prices but even if you are not in the U.S. I would be shocked if you cannot find the part for approximately the same price).
Regards,
Steve
RE: Hotend Test Immediate Failure
I believe he is referring to the load cell which is integrated with the heat sink assembly that costs $50.99
If it’s just a thermistor, then yeah they are quite cheap. I’ve got 3 on hand as spares.
RE:
If you have a multimeter just measure the resistance of the thermistor and the heater.
The thermistor should be around 100k ohm at ambient room temperature.
The heater should be between 1-20 ohms
Don't just go buying parts unless you know the exact problem and you're not covered by warranty.
Contact support, thats what they're there for...they'll pinpoint the problem and send you the part/s free of charge if you're covered.