cairn

I'll give that a try..

Same socket it's always been plugged into.. Can a socket become non-grounded?

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?

Solved! @gr5 You were right: Martin at Bondtech came back straight away 😃 Here is the link to the datasheet: http://www.micropap.com/pdf/nema17/SY42STH47-1684MA.pdf

Indeed he is, but this is a feeder motor from Ultimaker not BondTech.. thought I'd ask here first😊

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

Ha, inches! Don't run across those much anymore..

I usually end up with a model gap of at least 0.2mm to get a tight but moving fit between 2 parts, so that's 17x your gap!

There should be an entry in the "Maintenance" menu (on the printer) - it shows a date and a version name. OK thanks, so I have version 15.02.1ex from Feb 2015..

Haha no idea, how do I find out? (srsly) Anyway, regardless of the firmware version, I need to know how to reconcile the y-zero in S3D with the y-zero in the UM2..

Ah Oops, edited above, thanks (UM2 Ext) ..

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 )

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..

Thanks!

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..

Thanks neotko, Well, I'm not quite up to swapping out the board yet, so how to reduce the jerk speed? Can't see anything in S3D, is this an option in Cura?

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?

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..

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?

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..

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): 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

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%?

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?

Thanks, That's exactly what I needed to know..

.. I mean, say during a print I use the hardware control on the UM2 to Tune/speed/125%. Is the speed of motion the only thing effected, or does the flow rate also scale up at the same time? (I wouldn't expect the temp to change as well, but correct me if I'm wrong..) Cheers, C