Rm7
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Posts posted by Rm7
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Thank you, knew it has to be there but couldn't find using windows search
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Hello,
We've changed a burned-out Atmega on the UM2 motherboard. Want to have a clean firmware to upload to but the USB doesn't work.
Where could I find the firmware file compiled somewhere in the Cura installation maybe?
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Hello, lowering the current has made a huge improvement on one of my UM2s:
But the other had a much weirder problem when it would not as much as would skip steps in Z, but it would overshoot Z to start printing on air.
I plan to film the whole process with a couple phones in a couple of weeks to illustrate when we start needing that printer working again.
Thanks for the lowering current suggestion!
So there are 2 things that come to mind when you mention the Z is also moving. One is that there may be a new issue that UM is dealing with were some of the new boards have too much current and sometimes the Z axis drops suddenly for apparently no reason. It seemed to be related to too much current which seems strange but maybe it's an overheating thing either on the board or in the stepper motor (probably in the board).
One fix that worked for some people was lowering the current to 1200 ma. I'm not sure if that's the Z axis only or all the axis. You can do this on a single print with gcodes:
M907 Z1200 (1300 is default)
or
M907 X1200 Y1200 Z1200 (to do all 3 axes)
or you could just try removing the bottom cover and print with the printer on it's side (it prints fine upside down also) and with a fan blowing on the circuit board - just to see what happens (is the air around your um2 warmer now than it was in the winter?)
It might not be a heat issue and might just be something weird on the new boards - I know for sure if you use too much current the steppers do very strange erratic movements and make strange sounds.
The second thing that comes to mind is that there is still a bug in marlin where it sometimes moves some of the axes much faster than they can possibly move but only when moving at least 3 axes at once (and if the extruder is freaking out then all 4 axes). Normally this doesn't happen and the Z moves alone but if there is a gcode that moves Z at the same time as x or y that could possibly explain one of your issues. The bug is very consistent such that if you do the same set of gcodes 3 times it will consistently move the Z axis (and maybe E also) well above it's max speed. This seems less likely the problem.
There may be a 3rd issue. It would really help to see a video of the extruder when this happens. With audio.
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Hello, does anybody know how those fans receive voltage from the motherboard? We're getting 19V at 100% speed and 24V at 0% speed. Is that correct? How does it transfer to the end of the fan wires?
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And I've began to notice a similar problem with another previously good printing UM2:
It has started to constantly skip layers by mischievously retracting. The end layers at the legs is this occuring again just at the end of printing. And the video in the same link shows how weirdly the printer is acting after finishing the print!
I am not sure though if this behaviour is connected to the original problem.
Sliced with Cura 15.06.03.
I was told at the Google Group that it has been occurring to others and easy to fix but the guy has ironically suggested me to post this in the forums
Lets hope someone with an answer hears us!
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Happens to me at almost every print now.
I've tried slicing with Cura 14 and downgrading firmware to that of Cura 14. But it always decides to retract, skip a few layers and then continue printing without detracting back.
Attached is pictures of the result and G-Code which was being printed.
https://drive.google.com/file/d/0B01Jt12VWzuPYXd2WHZfQXhMV0U/view?usp=sharing
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We've resoldered the sensor it's very accurate now and the printer works great! Thanks!
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Out of interest how new is your machine? My UM2 is pretty much one of the first made, but I have been having this issue since I replaced the main board a few weeks ago. When I contacted support they seemed to think it is something to do with the latest boards.
Bob
Sorry to hear you're at the same boat though strength is at the numbers so more chance solving it!
I have 2 UM2 from very early on but one of them has the motherboard changed this Spring.
Now I'm delegating our intern to write a Python parser of the GCode to extract E moves only and search for where E movement is going back instead of forwards.
Hopefully it's at the Cura end as if it is a Hardware issue, sad prints acoming.
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edit: What do you mean by
when changing filament?
Hello, I've meant that the motor starts rapidly moving backwards for a long time as if it would be trying to change the filament.
I'll try to find the defective line in the G-Code, hopefully it is at fault here. But I'm not sure if I can search for it effectively. Was hoping someone would have had this problem before. Will write if I get to find it.
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Speed around 20mm/s at 0,1 layer height, 212C.
The problem manifests itself in a different way to regular skipping:
It is printing slowly happily quietly and suddenly there's a noise like when changing filament, the extruder motor starts going back at rapid speed, of course grinding the filament. And then the printing resumes but without any returning of the retracted filament. It happens rarely but sometimes multiple times per print at the same spot. Sometimes the print manages to continue with ~2 layers hanging on air, mostly the print fails after this "stunt".
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Hello,
My UM2 retracts a lot and fast once every couple of hours, always grinding filament only, not retracting, while printing support, but retraction being off.
What could be the reason for it? Tried updating firmware, changing slicers between the old Cura and the most recent official one downloaded yesterday.
The G-code, retraction just happened at around 3mm height +-0,5mm:
https://drive.google.com/file/d/0B01Jt12VWzuPOTh2VnY0LVhqbzQ/view?usp=sharing
Thanks,
Regards
Paulius
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All PT100s have the exact same temperature/resistance curve so any brand is fine - they come in all kinds of smt sizes. Or you can also just get a whole new bed from Ultimaker support.
But are we correct thinking that the part we are measuring in the picture is the PT100?
The part is giving us megaohms, as well as the terminals so logically this is the PT100, right?
I've picked this one:
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Hello,
We have 2 UM2 and one bed has stopped working gradually, the other one has started showing precisely 20C lower and then today stopped heating always showing 46C at 26C room.
We'll try the wiring today but do you think this in the picture is the temperature sensor and where can we order a new one to resolder?
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bad fan pwm j14 ultimaker2 board
in UltiMaker Cura
Posted
I need this badly too, any solutions?