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Unresolved unexplained temperature drop on hot end

Discussion in 'Troubleshooting' started by John Pearsley, Apr 17, 2021.

  1. John Pearsley

    John Pearsley Member

    Aug 8, 2017
    Likes Received:
    We suddenly see on a irregular basis after printing quite a few parts, the hot end temperature begins dropping from 210C until it gets to about 190C when it shuts off the printer because the can not longer extrude from low temp. The desired temp through out is 210C. We don't see anything like wiring connections that might explain it. After a while it will run a new build okay, at least until the next time it occurs.
    Any Ideas?
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Feb 21, 2013
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    One of a couple of possible things. Either it really is failing to maintain temperature or the thermistor for the extruder is failing.
    In the first case it is either the heater core on the hotend or the RAMPS board that drives the machine. The heater cores are cheap and an easy thing to try. https://www.partsbuilt.com/r1-heater-cartridge-robo-3d/
    If that does not sort it then likely it is the RAMPS board itself that is failing on the extruder heater output. You can replace it with a standard RAMPS 1.4 board it minor modifications (there is a thread on that) or use one from partsbuilt: https://www.partsbuilt.com/cart.php?suggest=4aa3bfd8-fb7e-4206-afda-0eb1f81a9294

    Sanity check all of the quick disconnect connections on the hotend for the heater and thermsitor are well seated together before you go swapping any parts :)

    P.s. it possibly could be the power supply as well, but that is less common.
    #2 mark tomlinson, Apr 18, 2021
    Last edited: Apr 18, 2021

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