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BlackCloud

Support structure starts in mid air (slicing bug?)

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Is this a bug? This is layer 343 in a print. You can see the start of a support line suspended in mid air.

 

image.png.72d8a11b667b8c9649502e13f3df80b7.png

 

Here it is at layer 346. It's starting to grow towards the other support but it's still in the middle of the air

image.png.130d1014aa49ba0e581a195157ed30ee.png

 

It finally joins the other support structure at layer 367.
image.png.eedd5d49d1cbdf107780c36b18199f28.png

Clearly this doesn't print. You get 24 layers of spaghetti then it *might* adhere to the remaining support and recover enough strength to actually support the remaining print.

For background, this is the model I am trying to print. Obviously a good support structure is critical.
image.png.dccb3c4e322042344faa1da4f5ce51ea.png
https://www.thingiverse.com/thing:2255905

 

 

 

Edited by BlackCloud
added help tag and link to the model I am trying to print.

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3 hours ago, BlackCloud said:

Come folks. Did I not describe the problem clearly?

Does anyone from Ultimaker haunt this place? 

 

Is there another slicer that supports a UM3?

Kinda a bit anxious there? I am here all the time, more or less, and I just saw this. So, yes, people 'haunt' the place.

Here is the thing, did you try to print and what happened if you did? I have seen this many times and did not have any issuese.

 

You are obviously playing a bit with support. Try and change density or remove the gradual steps. Do not freak out. If you are new, sometimes you just gotta jump off the cliff and see what happens.

Edited by kmanstudios

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Anxious? No. But no response after 10 days is usually a bad sign.

I've done a number of test prints and this part of the model doesn't work properly. It literally prints in the air. I've tried changing the density and other parameters for the support and other problems happen. The fact that that part of all the tests failed is what made me look so closely at the slicing.

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I downloaded your part and sliced it using the default 0.15 Layer Height settings except I checked the box to Generate Support and chose Extruder 2 for the Support Extruder.  I do not see the same result as you are describing.:

 

What layer height are you set at?  My build time is shown as 14h 34min.  Is that what you are getting?

 

 

image.png

Layer 343.JPG

Edited by XYZDesignPro
Removed one of the images

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3 hours ago, BlackCloud said:

Anxious? No. But no response after 10 days is usually a bad sign.

I've done a number of test prints and this part of the model doesn't work properly. It literally prints in the air. I've tried changing the density and other parameters for the support and other problems happen. The fact that that part of all the tests failed is what made me look so closely at the slicing.

10 days? As I said, I am here all the time. I had just seen it when I posted. So, I am thinking that happened with others as well.

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3 hours ago, XYZDesignPro said:

What layer height are you set at?  My build time is shown as 14h 34min.  Is that what you are getting?

 

 

I'm using layer height of .06. Print time is 36 hours.

 

I've tried all the different support patterns and they all do this though in slightly different spots.

At 0.15 layer height it doesn't do it. At 0.1 it does but not so badly that it won't join up with the other support after a few layers.

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Changed nothing from the default settings I outlined above except for layer height 0.15 to 0.06.  Here's what I get at Layer 346.  Everything is pretty much attached to something.  The default support settings are Everywhere, 45°, Triangles at 50%.

Layer346.thumb.JPG.a0d81e9ae70cc21026e5947b65799994.JPG

5ac918ccf37eb_Layer346Settings.thumb.JPG.3d1c0ccfe103d11c8f49d26484af0b81.JPG

 

Buils time is 35h 4 minutes.  Hope you have a generous supply of PVA.  :)

Hope this helps . . .

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Using the settings suggested, there is a very small anomaly at layer 344. Changing the support density to 25% makes the problem worse. This screen shot is 60 degree overhang and 25% support density. The second shot is 60 degree overhang and 50% density. Both at layer 343.

I am thinking of splitting the model into three pieces so I can use less support. But this section underneath the arm is a problem regardless.

 

image.thumb.png.18805808e2344c42df2515056e24646b.png

 

image.thumb.png.3e85269af7f32e01d985ee29a7417362.png

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Your model is already in 4 parts on Thingiverse.  Seems you really making this project a "project" . . .:)

 

In any case, I can appreciate where 25% support density would make the problem worse, but at 50% I suspect that even though you do have a stranded support segment at layer 343 the next layer or two above that will probably bridge the gap because, unlike 25%, the support structure is so much closer together.  Everything above that should be fine.

 

Try starting the print a layer 300 or so, and you won't have to waste filament and time?

 

Also, was there some reason why you reverted back to 60° support overhang?

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14 minutes ago, XYZDesignPro said:

Your model is already in 4 parts on Thingiverse.  Seems you really making this project a "project" . . .:)

 

In any case, I can appreciate where 25% support density would make the problem worse, but at 50% I suspect that even though you do have a stranded support segment at layer 343 the next layer or two above that will probably bridge the gap because, unlike 25%, the support structure is so much closer together.  Everything above that should be fine.

 

Try starting the print a layer 300 or so, and you won't have to waste filament and time?

 

Also, was there some reason why you reverted back to 60° support overhang?

 

Project of a project - like that never happens when 3D printing.

How do I start a print at a particular layer? Edit the gcode?

I've had models print fine with 60 degree overhang. Not sure this is going to be one of them. Too many weird protuberances.

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I am not getting the same results. So I have to ask:

  1. What slicer/version are you using?
  2. What position/angle are you placing object on build plate?

I am using the following:

  1. Cura 3.2 so that I am not using a beta, but the regular old Cura everybody has used and is stable.
  2. Imported object and just rotated 180° to have it facing outside of buildplate.

This is what I get at your layer from above.

IDoNotGetSameResults.thumb.jpg.3e056098fa88e816a922ad28b4b09741.jpg

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On 4/7/2018 at 4:28 PM, BlackCloud said:

 

Project of a project - like that never happens when 3D printing.

How do I start a print at a particular layer? Edit the gcode?

I've had models print fine with 60 degree overhang. Not sure this is going to be one of them. Too many weird protuberances.

 To start the print at at a place other than the actual bottom of the part, just select the model, then select the Move tool in the upper left of the screen.  Grab the blue arrow and drag the model down into the build plate. 

 

Move Tool.JPG

Edited by XYZDesignPro
Added the image

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