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Hi CarloK, Thank you. I guess the reading of a very low level was due to the presence of the material attached to the sensing pin. The 14 mm distance was one of the very first things that I checked, and corrected accordingly. Now the auto-levelling is working. Now I have to solve the problem of the (new) blocked solid printcore. Thanks again.

Thank you, JohnInOttawa I am running a UM3. Happily I have resolved the issue with the levelling as it goes in my reply to Enigma_M4. My colleagues and I are discussing the possibility of upgrading to an UMS3, and keeping this as a backup. But before that happens we must bring this one back to life. Thanks again

Hi Enigma_M4 Thanks for your response. The bed was rising at constant speed without stopping and rising slowly thereafter. Then I looked at your suggestion, and effectively, there was some debris in the small pit, but most concerning was that a blob of material was attached at the end of the sensing ping! After I removed that, and cleaned any residual (and from the switch pit as well) the automatic levelling did work nicely. So, problem solved. The only consequence of that is that one of the print cores was so clogged that it has to be changed (some one tried to run a print without checking the process and did not notice that the nozzle was pressing on the bed, and no material was coming out). Anyway, thank you again. And certainly, Occam Razor, that's the way many times.

Hi Before I started a new thread, I found this on, which is very similar to the problem I am observing. Some differences, though. We are using a UM3. The printer is configured to perform the auto-levelling before any print job. It had been working seamlessly for a long while until recently, when the auto-levelling started to fail. A prominent feature of the process was that instead of the bed just lightly approaching to the nozzle, it would actually press itself onto the nozzle before stating failure. We run several bed levelling diagnostic tests (included in the maintenance/diagnostics routines) always getting a sensor OK result. Because we needed to run several jobs, we switched to manual levelling, and it seemed to work fine, but not perfectly as before. I shifted attention to the nozzles, and decided that these may be needed to be changed, just out of the large number of hours they have been running. I got some new ones, installed them, and run an auto levelling, and it failed just as before. I run a manual levelling, and then tried to start a new print job, but got the message that the new nozzles should be XY calibrated. No problem, I started to run the procedure, but from the very beginning, the bed would rise to press onto the nozzles during the print-out. Cancelled the job, and try levelling again with the same odd behaviour. I had checked the forum for hints on what should be wrong, and I checked that the bed was 14 mm from the bottom plate, that the head sensor cables were not broken, etc. But nothing seemed to be out of place. So... We have now a UM3 standing quite and idle. Any hints? Is the sensor in the print head that has failed? I have got the log files from the UM3 but I am afraid I cannot understand them properly. I have uploaded them here. I appreciate any help. Thanks! Salvador ultimakersystem-ccbdd3001685.5.2.16.20200331.boot-2.log ultimakersystem-ccbdd3001685.5.2.16.20200331.boot-3.log ultimakersystem-ccbdd3001685.5.2.16.20200331.boot0.log cap_DFM-von-Neumann-Replicator_2021-02-19_17.51.28_X180.0Y155.0_sensor_reset.log cap_DFM-von-Neumann-Replicator_2021-02-19_17.51.40_N1_X162.0Y155.0.log cap_DFM-von-Neumann-Replicator_2021-02-19_17.51.45_N0_X180.0Y155.0.log ultimakersystem-ccbdd3001685.5.2.16.20200331.boot-1.log