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cairn

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Posts posted by cairn

    electric shocks from UM2 ext

    in UltiMaker 3D printers

    Posted

    I know there are a couple of old posts about this issue on the board already, but I'm getting regular shocks from my machine. I even get zapped inserting the SD card.. can't believe it doesn't wipe the data!

    I can't believe it's static buildup as it happens every few minutes. Also, never happened before with the machine in the same position, same power outlet, same environmental factors etc..

    Anyone know where I should look for a cause?

    Need Um2 ext feeder motor specs

    in UltiMaker 3D printers

    Posted

     

    I got the Bondtech upgrade for my UM2 ext (not+) which means I have a spare stepper motor. I plan to use it to drive an indexed turntable, but I can't find anywhere the specifications and power requirements for it. The sticker is unhelpfully worn smooth exept the numbers1648A. Can anyone help?

    Motor measures 42x42x49, I think it's 0.9 deg steps..?

    Thanks,

    Cairn

    incorrect Y axis origin

    in Firmware

    Posted · Edited by Guest

    Y-Oh-Y.thumb.jpg.5601fcf89e734eb6f76b19d0d9d580c6.jpg

    Not sure if this is an Ulti or an S3D question, but when I import a model (into S3D) and press center and arrange, the print will look good in the preview, but end up offset on the print-bed +4.5mm in the Y axis, and if it's too big, the print head will 'hit the wall' :(.

    I guess I need to either change the machine firmware setup, or change the machine definition in S3D.

    Any ideas?

    Thanks,

    Cairn

    (edit: My machine: UM2 Ext )

    Y-Oh-Y.thumb.jpg.5601fcf89e734eb6f76b19d0d9d580c6.jpg

    jerky speed problem

    in UltiMaker Cura

    Posted

    You still haven't included a video of this "jerky motion" so I'm still not sure what you are talking about.

    Yeah sorry, but its hard to see in the video so I didn't bother, but the effect is fast,fast,slow,slow,fast, etc.

    I'm already printing .2mm layers, I wouldn't want to go much thicker for cosmetic reasons. In the end I'm ok with 90mm/sec I guess..

    jerky speed problem

    in UltiMaker Cura

    Posted

    High quality and high speed don't match.

    You are right, but-

    Hehe, actually I also tested underspeeding on this project just to cover the bases, and there is definitely a minimum speed below which you get a lot of fogging/bubbling in the print (clear or natural colour filament, reducing temp didn't fix).

    It realy reminds me that you need to find the right balance of settings for each and every type of print..

    jerky speed problem

    in UltiMaker Cura

    Posted

    I looked into the changes for the last two years of your firmware and there isn't a change that improves print quality. Most important changes are for improving the material change and some other small fixes.

     

    Is there an automatic way to rebuild a factory file from gcode, or do you have to go in and copy all the settings manually?

    S3D is from another company and I can't answer this question as I don't have that software. Perhaps you can ask at the S3D forum?

    I think my explanation above explains why you see the jerky movements when slicing with Cura. Those curves are at the system's limit and then manually increasing the speed causes problems. Every system has a limit, even when the limit isn't always where you'd expect it. The UM2 can go fast, but not if you feed lots of tiny segments.

    To prove my theory it would be nice if you can reproduce the S3d results. For example, higher speeds can be achieved when S3d uses fewer line segments. Or perhaps S3d uses a lower speed (even when configured higher). Or, this proves you have found a bug in the Ultimaker software and we can look into it deeper (right now I can't find anything wrong).

     

    I'll try CURA and see if there's any difference..

    Meanwhile, I suppose I should file a feature request, but I don't know what to ask for.. a bigger better buffer? :)

    jerky speed problem

    in UltiMaker Cura

    Posted

    Thanks all for input.

    Meanwhile: Oh well,

    I was mistaken about the problem going away when you change the speed in the slicer. After a bunch of test, I see the effect whenever I go above 90 mm/s whether youset this in S3D or on the 'tune' dial on the UM2.

    It's a shame, as I'm getting good layer adhesion at 110 mm/s, just the speed wobble effect.

    In the end, I just need the patience to print slower, esp on these single-thickness spiral-mode projects..

    Speed.thumb.jpg.55fb13b619cfd7d696177e53110417e5.jpg

    Speed.thumb.jpg.55fb13b619cfd7d696177e53110417e5.jpg

    jerky speed problem

    in UltiMaker Cura

    Posted

    Could you post the gcode for that sped-up version as well? (same layers please).

    Which firmware version have you loaded in your printer?

    Ah, unfortunately I didn't save a (S3D) factory file for this project.. I'll try to rebuild one from the gcode when I have a mo..

    How do yo check which firmware you have? I haven't updated ever, so whatever was in the box 2 years ago. Does newer firmware possibly have a larger buffer? Every other part of the system seems to be able to operate at higher speeds..

    jerky speed problem

    in UltiMaker Cura

    Posted

    Well, I'm not sure..

    There's nothing unusual about this kind of point density for a curve (taken from a sample of the gcode in the problem area):

    curve.thumb.jpg.d1f727028f0e85e7a0e2564c496f8535.jpg

    and l'm sure I've printed much denser models without issue, but I don't often increase the speed on the fly.

    Looking at a sample of the code, the F value remains constant, (reset with G92 each layer by the looks of things), so this is still a puzzle.

    If I increase the speed in the slicer (S3d) the problem goes away, which suggests something whacky happens when you tune the speed on the UM2..

    G1 X163.328 Y119.384 Z27.859 E16.4758

    G1 X163.564 Y119.674 Z27.859 E16.4842

    G1 X163.787 Y119.979 Z27.859 E16.4928

    G1 X163.994 Y120.295 Z27.859 E16.5013

    G1 X164.184 Y120.624 Z27.859 E16.5099

    G1 X164.356 Y120.961 Z27.859 E16.5184

    G1 X164.511 Y121.308 Z27.859 E16.5270

    G1 X164.644 Y121.658 Z27.860 E16.5354

    G1 X164.760 Y122.016 Z27.860 E16.5439

    G1 X164.855 Y122.377 Z27.860 E16.5524

    G1 X164.932 Y122.742 Z27.860 E16.5608

    ; layer 140, Z = 28.060

    G92 E0

    G1 X165.137 Y123.158 Z27.860 E0.0105 F3510

    G1 X165.175 Y123.545 Z27.860 E0.0192

    G1 X165.191 Y123.926 Z27.860 E0.0278

    G1 X165.187 Y124.304 Z27.860 E0.0364

    G1 X165.164 Y124.678 Z27.860 E0.0448

    G1 X165.121 Y125.046 Z27.861 E0.0532

    G1 X165.056 Y125.431 Z27.861 E0.0620

    G1 X164.970 Y125.806 Z27.861 E0.0707

    G1 X164.870 Y126.160 Z27.861 E0.0790

    G1 X164.749 Y126.513 Z27.861 E0.0874

    G1 X164.605 Y126.872 Z27.861 E0.0962

    G1 X164.440 Y127.227 Z27.861 E0.1050

    G1 X164.262 Y127.560 Z27.861 E0.1135

    G1 X164.064 Y127.887 Z27.861 E0.1222

    curve.thumb.jpg.d1f727028f0e85e7a0e2564c496f8535.jpg

    jerky speed problem

    in UltiMaker Cura

    Posted

    But anyway I'm not sure why you care?  The current accel settings on UM printers is set so that it prints just fine.  Tell me why you care about jerky speeds and then I can tell you more.

    Hi gr5,

    My machine is a UM2ext.

    If you take a look at the image, you can see the degradation in print quality when the speed is increased.. and you can really notice the print head going faster and slower in jerky steps.. obviously undesirable. The effect disappears when you drop the speed back down to 100%.

    It's as if the UM is dithering between fast and slow speeds, maybe to acvhieve the 'average' speed of 125%?

    Jerky.thumb.jpg.cd7748f1c226b1f6f244e6af1533b010.jpg

    jerky speed problem

    in UltiMaker Cura

    Posted

    printing at 100 %, the print head moves at a constant speed, but if I increase the speed on the fly while the print is running, the print head moves in a really jerky way, accelerating and decelerating. Anyone know how to prevent this?

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