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Build plate crash at end of print.


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Posted · Build plate crash at end of print.

We started having an issue with our UMS5, whereas the build plate is dislodged to the right, at the end of the print.

We observed the following:
 
At the end of the print, the printer head moves all the way over to the left to purge a little material out and cool down the left side print core (i believe).
At the same time, the bed raises to a higher point.
After the left side is cooled, the printer head moves over to the right side to purge and cool down the other printer core.  During the move to the right, the bed stays raised and the printer head collides with the printed part.
 
Any ideas what might have caused this, or how to resolve?

PXL_20220426_165505876.jpeg

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    Posted · Build plate crash at end of print.

    What?  That's crazy. 

    1) What version of firmware do you have on the printer (you can see it in the maintenance menu on the front of the printer). 

    2) Could you please post both the ufp file and the project file here? 

    3) Do you print using USB flash or through digital factory?

     

    I'm wondering if you have something wrong with your printer profile.  For #2 project file (which will include your model - I hope it's okay to publish) do "file" "save project as".  For the #3 ufp file hopefully it's still on your flash drive so you can send it to us - a ufp that definitely has the issue.

     

    By the way at the end of the print it should RETRACT.  Not purge.  It cools down both cores to a specific temperature.  When it reaches that temperature it retracts.  This keeps the nozzle cleaner and the shape of the filament cleaner and it makes it easier to remove a core or to remove the filament later without having to heat things up.  It should not move the head around while doing any of this.

     

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    Posted · Build plate crash at end of print.

    I've recently had the same thing happen, except it just broke the print off the bed. When the print head moves to the unloading position the bed is raised at the same time and the nozzle can hit the printed part from above or hit it with guide rods when moving to unload from the second core.

     

    This raising of the bed doesn't happen every time, and so far I haven't figured out what makes it happen. Firmware 7.0.2.0 for me.

     

    With material station it extrudes a little material while cooling down before pulling the filament to the parked position. This is done on the left for core 1 and on the right for core 2 (same as loading filament), so if both are used it moves to the other side of the bed at some point when unloading.

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    Posted · Build plate crash at end of print.

    If you guys suspect the firmware doing something strange suddenly, try a Digital Factory Reset. It does reset the Digital Factory (so you would have to reconnect the printer, sorry) but it seems also to act as some kind of soft reset for the firmware.

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    Posted · Build plate crash at end of print.

    yep, we get this every now and then. Usually destroys the rubber around the nozzles, often snaps the job and pushes the glass way off. We had a thread about it not so long back. Seems to happen at random no matter what firmware we use.

     

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    Posted · Build plate crash at end of print.

    Okay I understand better now.  With the material station (which I don't have - I just have a plain S5) it does a cold pull for each core and it lowers the right core before doing the right core (which should be unnecessary). 

     

    The bug is that the bed is all the way up when it does this final procedure and when it goes to swap to the other core it hits the part.  People who don't have a MS don't have this problem because it doesn't do the cold pull (it does a kind of warm pull).

     

    @CarloK  @robinmdh - I know where to submit Cura bugs but where do these 3 people submit a firmware bug so that the firmware team looks into it?

     

    Should they do:

    support.ultimaker.com  and click "submit a request" in the top right corner?

     

    Or is there a more direct/better way?

     

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    Posted · Build plate crash at end of print.

    I guess I could contact our reseller who provides support, but as it is I don't really have much to tell them. So far I've seen it hit the print only two times. If only I remembered which prints it happened with so I could try to print the same gcode again and see what happens.

     

    Regarding the lowering of the second core, I don't quite remember how high it sits, but perhaps it is done so that you never extrude from the second print core in the high position to prevent possible extruded plastic curling upwards and going through the hole in the silicon cover and up above it? But as I said, I don't quite remember how much the nozzle stays in contact with the cover in the up position

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    Posted · Build plate crash at end of print.

    I've had a job that hits/destroys the part on finishing, but when I print the exact same file again the problem doesn't happen... 

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    Posted · Build plate crash at end of print.
    15 hours ago, Nosybottle said:

    I guess I could contact our reseller who provides support, but as it is I don't really have much to tell them.

     

    Logfiles might help as they could contain a hint why it is driving to a wrong location. The quicker you download them after it happened, the better.

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    Posted · Build plate crash at end of print.

    Ahh.. I didn't think of that. I'll try to remember the next time I see it happen. Thanks.

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    Posted · Build plate crash at end of print.

    So it's common for the print head to knock a part off the bed in the middle of a print - it's a bit complicated but you can have the part higher than the currently printed layer on certain kinds of overhangs - the plastic sticks up.  So this is a boring, old problem fixed with better adhesion techniques.

     

    But much more interesting is if the part comes off the bed at the END of the print - particularly hard enough that the glass slides out of the clips.  This sounds like a firmware bug (possibly a cura bug but I doubt it).

     

    Regarding going to the lift switch maneuver.  There are gcodes to change a core temperature without doing the lift switch (you add T0 or T1 in the middle of the gcode).  But the only way I know to move the feeder is to do a gcode T0 or T1 by itself which does the lift switch maneuver.  Some printers let you control each feeder independently and simultaneously with gcodes but the firmware on the S5 I believe doesn't let you so I think you have to go over to the lift switch to do a cold pull for both cores.

     

    For me I'm pretty sure it always moves the bed down to the very bottom at the end of a print.  Before it messes with the retraction on each print head.  But I don't have the material station so the procedure is a little different.

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    Posted · Build plate crash at end of print.
    On 5/4/2022 at 3:40 PM, gr5 said:

     

    @CarloK  @robinmdh - I know where to submit Cura bugs but where do these 3 people submit a firmware bug so that the firmware team looks into it?

     

    Should they do:

    support.ultimaker.com  and click "submit a request" in the top right corner?

     

    Or is there a more direct/better way?

    support.ultimaker.com is the correct method for submitting (firmware) bugs. Note that the "submit a request" button is not available on the front page, you'll have to click one page further.

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    Posted · Build plate crash at end of print.

    @wcorbit721The printer should not behave in the manner you posted here. In order to look into this we need more information from you. Could you please answer @gr5's questions here above? Without that information we can do nothing.

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