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Blowing hot ends

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    Blowing hot ends

    I went back to my hictop controller board after blowing up 2 hot ends with my MKS 1.5 board.. the hictop is running fine but I wanted my own controller with graphics and had no problems installing marlin on the 1.5 mks it printed great the first time after tuning it and getting all the hictop specifics in the configuration.h and rewiring. But I did notice when heating the hot end it took a while to get to 205 it would jump to 240 then slowly drop to 198 then shoot to 220 then finally print. Then it started heating failed. So I swapped hot ends with a new one and it did it again.. is it possible the 24v hictop is blowing cheap 12v hot ends? I'm in the middle of building a 500mm tall reprap with 1515 makerbeams and a 12v 30a.. should I try the 12v with the MLS or just use my Mega and rails & not risk another heater? Maybe the heater in my amazon hot ends are cheap?

    #2
    Also I have adjusted the 24v hictop supply to be exactly 24.0 v with the potentiometer on it. It was running 23.8

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      #3
      Never run a 24v system with 12v, but have you PID tuned the hotend, sounds like its just on/off with the heating

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        #4
        Thanks! I bet that is it.. i just tuned the stepper voltage with the pots and speed and ditection but left the pid settings as default.. ill enable PID_AUTOTUNE_MENU and lower the maxtemp and give it a shot.

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          #5
          That works.. I kept the hictop stock except for its now my off standard ( .25 and 1.00 nozzle ) printer.. but my new beast is up and running and heating perfectly after tweeking the PID settings

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