Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 12:57AM |
Registered: 9 years ago Posts: 916 |
Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 02:34AM |
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Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 02:43AM |
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Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 05:44AM |
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o_lampe
@nebbian
Do you use v-slot wheels on your delta? It seems the tree rings pattern changes with z-height, so it might be an imperfection in a wheel or the slot itself.
Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 11:06AM |
Registered: 9 years ago Posts: 916 |
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dc42
Why are you getting tree ring patterns on vertical sides of your print? I can't see any reason why you would, unless you are using a layer height that is not a whole number of microsteps, or you are using some sort of skew compensation so that the face is not quite vertical. It's on top solid infill that you can expect tree ring patterns.
Re: Testing the effects of microstepping and segmentation on print quality April 02, 2017 09:21PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 02:32AM |
Registered: 9 years ago Posts: 5,232 |
Quote
nebbian
Hey DC,
Can you please print a cube at 1/16 ustep, no interpolation, with a layer height of 0.101?
I'm hoping to see that tree ring pattern on the front face.
Thanks in advance.
Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 03:45AM |
Registered: 9 years ago Posts: 916 |
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o_lampe
If we were able to "force" the ring tree pattern and then print stuff in laywood filament, it would be a big bonus.
Pretty interested to know if it could be done on a cartesian printer too?
Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 04:04AM |
Registered: 11 years ago Posts: 734 |
I would rather modify the slicer. Something along the lines of black & white image which would be mapped on the wall. Color transition in the image would represent micro step difference in the wall. Kind of how bump mapping works in 3D stack.Quote
nebbian
I don't think it would be easy on a cartesian, you'd have to very slightly angle the face backwards, and introduce a very slight curve into it. Not impossible, but a bit of frigging around with the model.
Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 11:30AM |
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Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 07:59PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 08:56PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 03, 2017 09:44PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 04, 2017 01:30PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 04, 2017 02:31PM |
Registered: 10 years ago Posts: 14,684 |
Quote
nebbian
Hey DC,
Can you please print a cube at 1/16 ustep, no interpolation, with a layer height of 0.101?
I'm hoping to see that tree ring pattern on the front face.
Thanks in advance.
Re: Testing the effects of microstepping and segmentation on print quality April 04, 2017 08:53PM |
Registered: 9 years ago Posts: 916 |
Re: Testing the effects of microstepping and segmentation on print quality April 04, 2017 08:57PM |
Registered: 9 years ago Posts: 916 |
Quote
masterbinky
Anyone have a good way to rule out the filament as a source of the issue? I find when I check my sainsmart dilaments, its diameter varies in an oscillating pattern. Two perpendicular measurements taken per point letting me approximate its cross section, which is roughly consistent but still leads me to believe it's truely an oval cross section making a corkscrew shape that I have to hope is a consistent volume. Probably made by deformation in the spooling step of manufacturing. Can't shake the feeling that could be the source of the larger banding frequencies.
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 02:21AM |
Registered: 10 years ago Posts: 14,684 |
Quote
nebbian
Thanks for doing the test, but you really need to reflect light off the face to have any chance of seeing the tree ring pattern. Just looking at a surface in diffuse light won't tell us anything. Even matte filament won't show it, you need shiny filament.
I don't think that the tree ring pattern has anything to do with segments either. I'm sure that it's to do with discontinuities in the stepper motor current as it crosses the zero point. Changing steppers to fast decay (instead of mixed decay) really reduces this effect. Perhaps your duet drivers are already in fast decay.
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 06:36AM |
Registered: 11 years ago Posts: 734 |
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 06:40AM |
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Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 10:37AM |
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Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 02:42PM |
Registered: 10 years ago Posts: 14,684 |
Quote
hercek
dc42, was your last picture printed at 50 mm/s? What acceleration? What kind of belts do you use?
The reason I'm asking: I do not care much about the patterns on the walls; I would like to get more info about the "ringing" on the left corner.
I did not experience this myself but I read that regular patterns on prints can be also caused by belts either not fitting the pulleys precisely or running the teeth side of a belt over a smooth idler (which happens when belt is not twisted before running it around idler). But I guess almost nobody has this problem.
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 05:33PM |
Registered: 11 years ago Posts: 734 |
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 06:57PM |
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Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 08:05PM |
Registered: 11 years ago Posts: 734 |
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 08:32PM |
Registered: 9 years ago Posts: 916 |
Re: Testing the effects of microstepping and segmentation on print quality April 05, 2017 08:57PM |
Registered: 9 years ago Posts: 916 |
Re: Testing the effects of microstepping and segmentation on print quality April 06, 2017 02:38AM |
Registered: 9 years ago Posts: 5,232 |
Quote
If you know how to easily change these drivers to fast decay, then I'd love to be able to do this test.
[www.ebay.com.au]
Re: Testing the effects of microstepping and segmentation on print quality April 06, 2017 06:08AM |
Registered: 11 years ago Posts: 734 |
Re: Testing the effects of microstepping and segmentation on print quality April 06, 2017 07:44AM |
Registered: 10 years ago Posts: 14,684 |
Quote
dc42
Quote
hercek
dc42, was your last picture printed at 50 mm/s? What acceleration? What kind of belts do you use?
The reason I'm asking: I do not care much about the patterns on the walls; I would like to get more info about the "ringing" on the left corner.
I did not experience this myself but I read that regular patterns on prints can be also caused by belts either not fitting the pulleys precisely or running the teeth side of a belt over a smooth idler (which happens when belt is not twisted before running it around idler). But I guess almost nobody has this problem.
Print speed 50mm/sec
XY acceleration 3000mm/sec^2
Jerk 600mm/min
GT2 belts on 16t drive pulleys and 16t toothed idler pulleys
1.68A motors running at 1.0A
I'll try repeating the print with different acceleration/jerk/motor current.