Odd Layer Preview

Software issues and solutions
lswatson
B9 Wizard
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Odd Layer Preview

Post#1 » Fri Jul 29, 2016 12:08 pm

I've started looking at my prints using Job Preview. Usually no surprises.
However, with this model, I'm seeing an odd pattern in my supports. They were made from primatives in Rhino with a fillet at one end. Which I do all the time.
The print is printing just as its represented, so parts of my supports are not printing. The discs should be solid white.
Any ideas as to cause and how to fix?
Attachments
Screen Shot- Odd  B9 Preview.jpg

danfurlano
B9 Maker
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Re: Odd Layer Preview

Post#2 » Fri Jul 29, 2016 12:28 pm

Total guess. Looks like triangles. Maybe orient the triangles in the same direction or refine the mesh and retry.

Total guess.

lswatson
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Re: Odd Layer Preview

Post#3 » Fri Jul 29, 2016 12:38 pm

Thanks for posting.
I just double checked the model. Rhino check is fine, looking at the STL in various modes shows nothing like this pattern. Everything look orderly in the tri pattern.
The discs are actually the tops of cones made from a primative. I did do a 1D scale, to reduce the height and to get them to match for alignment on the build platform.
I guess I need to go back and reconstruct them from scratch.
I'm letting the print run, but not too hopefully. And the supports are my sprues, so if they are not right, no chance for the casting to be right.

lswatson
B9 Wizard
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Posts: 1157

Re: Odd Layer Preview

Post#4 » Fri Jul 29, 2016 1:18 pm

Well, this is vexing.
I completely remade the supports from scratch, with no Scale editing. I used Trim with a cutting plane, then Join to make them solid. Changed the build layer. Did all that twice, and Preview looks the same.
I've never seen anything like this on any other model.
Any ideas?

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Metalcaster
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Re: Odd Layer Preview

Post#5 » Fri Jul 29, 2016 2:05 pm

Looks like hidden art in the stl file.
I have received files from customers that had weird things in the background of a print.
went back to Rhino and set it to " show hidden"
and sure enough... something was in the background.
Don't know if thats the problem...

lswatson
B9 Wizard
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Posts: 1157

Re: Odd Layer Preview

Post#6 » Fri Jul 29, 2016 3:31 pm

Thanks, Daniel.
I have no Show Detail command.
I do have ShowSelectedinDetail,
but I get this.....
Must have a detail viewport active to run this command.

I don't see a setting to designate a "detail viewport".

lswatson
B9 Wizard
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Posts: 1157

Re: Odd Layer Preview

Post#7 » Fri Jul 29, 2016 3:54 pm

Found a rebel mesh in X Ray mode.
Deleted it and that seems to have helped.
Onward and upward.
Tomorrow.

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Robert Howle
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Re: Odd Layer Preview

Post#8 » Sat Jul 30, 2016 1:10 am

lswatson, what version of Rhino do u use to model?

Robert
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lswatson
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Posts: 1157

Re: Odd Layer Preview

Post#9 » Sat Jul 30, 2016 6:19 am

V5

lswatson
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Re: Odd Layer Preview

Post#10 » Sat Jul 30, 2016 10:13 am

I went back to my original files from about 10 years ago and found an error when the model was meshed.
That was cleaned up manually and it looks like the model Slices and Previews in the normal way.
So, I'll nest and try another print. Hopefully the head banging is over.

lswatson
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Posts: 1157

Re: Odd Layer Preview

Post#11 » Sun Jul 31, 2016 5:18 am

Got good prints.
In this instance, when the original model had some meshing issues and fragments of duplicate surfaces, when sliced serious flaws appear throughout the model, including in supports. So the flaws sort of got blown throughout the entire print. This resulted in areas showing up as black when they should be white (print) in the Preview.
I also discovered that using the scroll wheel on the mouse moves the Preview through the layers very quickly. It does skip some layers, so its not a good 100% Preview, but its good for a quick look.

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