Hot end questions

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barry99705
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Hot end questions

Post by barry99705 » Sun Sep 03, 2017 9:03 am

Do thermistors and heater cartridges slowly go bad, or just all at once? In the last month or so, I've had problems keeping temperature. Yesterday I had two prints quit because it couldn't keep up. Printing with an e3d v2, .4mm nozzle, 50mm/s perimeters, 55mm/s infill. All this is wired through seeme's he280 accelerator board. I really wanted to like that hot end, but couldn't keep the fuse ferrules tight.
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Re: Hot end questions

Post by geneb » Sun Sep 03, 2017 9:57 am

Do you have a sock on the heater block?

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Re: Hot end questions

Post by barry99705 » Sun Sep 03, 2017 10:28 am

Yep. Just for giggles I unplugged the part cooling fans and that helped a little, but it's still not keeping up.
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Re: Hot end questions

Post by Mac The Knife » Sun Sep 03, 2017 10:59 am

It wouldn't hurt to double check the hotend connections at the RamBo board,,,,
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Re: Hot end questions

Post by barry99705 » Sun Sep 03, 2017 2:51 pm

Yea, that was the first thing I checked. They're tight.
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Re: Hot end questions

Post by geneb » Mon Sep 04, 2017 10:25 am

I'd almost suspect the power supply if it's a v2. Can you try monitoring the 12v rail while you're printing?

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Re: Hot end questions

Post by barry99705 » Tue Sep 05, 2017 8:15 am

I'll give that a shot, will update later.
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Re: Hot end questions

Post by barry99705 » Wed Sep 06, 2017 5:29 pm

Hot end connection bounces between 11.55vdc and 9.25vdc while printing. From the power supply I'm getting 12.31vdc.
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Re: Hot end questions

Post by geneb » Thu Sep 07, 2017 8:55 am

The voltage makes sense at the hot end - it's the PWM you're seeing. The raw output from the power supply seems good though.

It may be a case of the heater cartridge beginning to fail. If it was ME, I wouldn't just change the cartridge - you figure if you're going to tear into the thing, might as well replace the thermistor at the same time and save some hassle.

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Re: Hot end questions

Post by barry99705 » Thu Sep 07, 2017 11:27 am

Cool. Thanks for the second opinion!
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Re: Hot end questions

Post by lightninjay » Thu Sep 07, 2017 12:31 pm

I had something similar happen, but it turns out my heater cartridge was fine, the Thermistor was failing, and so it kept underreporting temps. This eventually would lead to a Decoupled error being thrown and the hotend shutting off. My stupid mistake would be to turn the printer off, turn it back on, and continue trying to heat the hotend. This cycle would continually heat the cartridge, even though the thermistor was not reporting any temperature change. Ultimately I melted the PEEK section of my hotend and had to swap out for my Prometheus from the stock V2 hotend. Once I discovered it was my thermistor, I replaced it, and I have had stable temps ever since.
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