Hi

A couple of days ago the hotend wouldn’t heat up and i got a couple of errorcodes/warnings in the display. The bed heats up just fine, so i ordered a new hotend parts (heater, thermistor and a new aluminum block). Changed all of this, but still the same error. I can se that the thermistor works because it changes values in the display when touching the thermistor-end. Any good ideas why the heater doesn’t heat?

  • morbidcactus@lemmy.caEnglish
    3·
    1 month ago

    Honestly $80 sounds like an absolute bargain, you straight up can’t build one yourself for that price, a mainboard and like 2-3 steppers would go over that and everything I’ve seen about that printer says it’s a very capable, budget friendly option. It looks like that’s using a btt mainboard which I totally swear by, straight up shorted a fan header on an octopus pro and it’s still chugging along just fine, anecdotally they’re pretty hard to kill.

    I’d totally check your wiring before replacing a board, a break or bad crimp could totally be your culprit here, and those are a heck of a lot less work to remedy, thermal protection does totally get tripped if there’s an intermittent fault with the thermistor (including cabling), I had it happen on a prusa where it’d kick out but not have anything obvious temp wise on the display, only noticeable in a temp plot.

    • UncleStewart@sh.itjust.worksOPEnglish
      2·
      1 month ago

      The thermistor temperature reacts to me touching the thermistor-end. This shows in the display- So i believe this is not the problem here…

      • morbidcactus@lemmy.caEnglish
        2·
        1 month ago

        Fair, a wire break can be annoying though, often they’re intermittent, and the display often doesn’t respond fast enough to show that, but thermal protection will.

        I’d totally consider taking a look at the connectors to the board for the heater cartridge, see if there’s good contact being made, check for any signs of things like scorching check end-end continuity. Looking at the schematics for that mainboard Btt skr 1.4 it looks like there are LEDs on all of the MOSFETs, it will give you a visual indicator of the board state, to help narrow down your troubleshooting.

        • UncleStewart@sh.itjust.worksOPEnglish
          1·
          1 month ago

          Thanks for the links. Can’t see any scorching, and everything I’ve measured seems OK. If there are LED’s on the mainboard, i don’t know how to light them. As of now there are no lights on the motherboard, but everything beyond that heater works…