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Helvetosaur

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  • 3D printer
    Ultimaker 3 (Ext)

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  1. So I managed to get the sensor board and the cable replaced and the machine is now fixed - now detects the bed correctly and auto-leveling runs fine. Thanks for the info and the links. That being said, I find that the whole cabling arrangement of the head is one of the poorest engineering implementations I have seen, the cable routing is awful and the wire gauge/connectors are tiny. Plus the sheet metal "pins" that hold the sensor board in place are actually too fat to fit in the holes in the board, requiring a lot of pressure to either remove the board or replace it.
  2. I ordered the replacement cable as well as the sensor board and they got here late last week. I will hopefully have some time to try and fix it this week. I am still in doubt as to how to properly remove and replace the old sensor board, the attachment to the head seems tiny and fragile, and I don't want to break anything.
  3. Hi all, After the auto leveling procedure on our second UM3 failed repeatedly, I found the article that said check the capacitive sensor cable - and after pushing the wires around, found that the red wire was indeed broken. It looks like the cable is a separate part from the sensor itself, but it's not obvious how to connect them - is that a solder connection (as some other posts seem to indicate)? Is it advisable to change out the sensor at the same time? I am also a bit in doubt as to how to remove the sensor itself from the hinged fan/nozzle cover. Is there a recommended procedure for that? The little clips holding the sensor seem very tiny and delicate. Should I be removing the entire fan/nozzle cover assembly (after unplugging the cables)? Thanks in advance, --H
  4. OK, that was indeed the problem, machine is now running correctly, thanks again! I now have a problem with the other machine 😞 , will post a new topic..
  5. Hi there, First time poster here. I have been asked to take care of a couple of Ultimaker 3+ machines that are in a local school here; as a professional modelmaker, I have a fair amount of experience with other 3D printers (Stratasys, Formlabs) but my experience with Ultimakers is relatively limited. In testing the school machines the other day, I found one of the machines has a problem when wanting to print dual material – model (PLA) in extruder 1 and support (breakaway) in extruder 2. The mechanism/process that allows the machine to switch between which extruder is printing appears to be broken. To switch materials, the machine head has go to a right-rear position to engage the slot which flips the lever that switches the extruder vertical positions. It seems the XY position that the machine sends the head to in order to flip the lever is incorrect - the head appears to go too far to the rear. In doing so it misses the slot where the change lever should engage and at the same time it hits the rear limit - which causes it to lose encoder steps. The result is that it starts printing the support material with the support extruder still in the upper position – the material is extruded in the air - but even worse, if I flip the lever on the head to switch extruders manually, the lost encoder steps result in a large misalignment (~10mm) of the succeeding model layers in Y. The print has to be aborted at that point. It is still possible to print OK with just extruder 1 (no support material), so the machine is currently usable in the same way as the Ultimaker 2 with a single print head. Why I am posting here is because I am not sure if the problem lies in the firmware of the machine – the wrong position is stored somewhere and that it might be correctable with new firmware or some other software-level intervention, or if this is more of a hardware problem that will require changing some parts or electronics boards. If anyone has any experience with this or has some ideas where I should start looking, I would appreciate it!
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