MK4S high flow nozzle and lack of power
Hi,
yesterday I converted my MK4 to the MK4S and encountered the problem that the self-test for the heating of the nozzle fails and when ignoring it, the error #26204 (thermal runaway) occurred when printing (after approx. 1:30h).
I did some research and came across the parameters for the test in the source code: The nozzle must be heated from 80 °C to at least 195 °C within 42 seconds (20 °C less with a silicone sock) and my printer doesn't manage that. Without the sock it reaches ~190 °C after 42 seconds and with the sock just 162 °C. I suspect that the heating power is not sufficient here and that the temperature has dropped too much during printing due to the conversion to the high-flow nozzle.
After today's tests, I can confirm this: With the normal nozzle the PWM is ~70-80%, with the high-flow nozzle it rises to 100% with long movements and the temperature drops from 235 to 229/230 °C.
Is this a fault in the design or is there something wrong with my heating cartridge? Has anyone had similar experiences?
The printer has currently been running for ~408 hours.
(The fact that the housing of the LCD does not harmonize with enclosure is currently just another step in my pissed-offness. What the hell they doing?)