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3d - Printworx

Malyan M150 suddenly stops extruding after 2 or 3 layers

Started by nate80, Tuesday,December 19, 2017, 11:54:42

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Quick update. Further testing (even after I said I wouldn't!) and info from Malyan reveals that the thermistor was almost certainly to blame. It seems to have been supplying incorrect temp values to the control board (still not sure how though).

The melzi board thought the temp was less than it actually was, so it continued to provide unrestricted current to the heater element which, in turn, overheated the stepper motor. The stepper motors control board driver overheat protection system then kicked in and shut the extruder stepper motor off. The standard Malyan m150 marlin firmware doesn't have included thermal protection turned on (mad but true), so the control board let's the rest of the print continue.

The reason the stepper motor shut down at set times of varying length from print to print was due to the differing heat settings required for each model. It shut off quicker on the spiral model (for example) because the standard print temp was 15 degrees higher than the Malyan test file, so the stepper motor was already closer to its overheating temp by the time the print got going.

As far as I am aware, other than how the thermistor failed, that explains the fault. I'm going to buy a few spare thermistors for when the currently fitted one fails.


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