I think must CAD programs will represent a cylinder as a mathematical cylinder. The issue is I believe that STLs are polygon based so the object in the CAD program has to undergo tessellation resulting in the surfaces you see.
DesignSpark Mechanical lets you control the surface generation was you "Save as STL". Look for similar options in other programs.
The unavoidable issue is that the more surfaces you use to get a smoother look, the longer Cura takes to slice the object
I haven't used SketchUp in a long long time but I remember that by default the "resolution" of a circle is piss poor in it. You can change that when you select the circle tool:
http://help.sketchup.com/en/article/94740
OpenSCAD can create great cylinders with any amount of faces you want.
OpenSCAD can create great cylinders with any amount of faces you want.
yes, I did one cylinder with 200 faces and when I print it it is not good. I will post a picture later.
yes, I did one cylinder with 200 faces and when I print it it is not good. I will post a picture later.
http://umforum.ultimaker.com/index.php?/topic/5007-surface-looks-a-lot-worse-in-cura-1403/
This is the cylender. It has a wall thickness os 1.6 mm. 200 faces, scad.
As you can see top and bottom layers look good, top in the left side. The rest is horrible, really horrible.
Print speed: 100 mm/s
bottom speed: 50 mm/s
It looks like the infill overlap might be a bit on the high side.
It looks like the infill overlap might be a bit on the high side.
It is set to 15%.
However, wall thickness is 1.5 mm and shell thickness is 0.8mm. So the wall is solid and when printing I saw is solid.
I have increased wall thickness and the result is the same.
BTW, the ugly wall is visible in the inside face as well. :-| :-|
I have increased wall thickness and the result is the same.
BTW, the ugly wall is visible in the inside face as well. :-| :-|
See the topic I linked, might be related to a bug in the latest official Cura
See the topic I linked, might be related to a bug in the latest official Cura
I will have a look...
because I reduced infill overlap to 1% and the result is the same.
20x20 cylinders printed on a UM1 generated out of DesignSpark Mechanical.....
One has twice the number of faces as the other but I can't tell which. I think I'm at the limit of the UM1's resolution.
Cura 14.04-RC1
Layer 0.1mm
Shell 0.8
Bottom/Top .6
Fill: 0
Speed 50
Yes, this is what I want.
Are they sliced by the last version of Cura?
I am designing the cylinders with another softs... but at the moment I have similar results.
BTW, where can I download previous versions of CURA?
I found previous version in my computer....
2 hours and 43minutes printing time with previous version
7 hours with latest version...
the same model, of course...and same settings...
We need a solution!!!
I going to print with old version... more tomorrow.
They were sliced with Cura 14.04-RC1. I did notice that there is a significant seam on the inside but they were solid so Cura may have did something such that it didn't attempt to create an internal finished surface.
Looks like you can get older versions here : http://software.ultimaker.com/?show=all
The betas are closed but you can get them if you know were to look on the forums.
The location of the betas aren't exactly a guarded secret so here's the link 
http://software.ultimaker.com/Cura_closed_beta/
Yes, no secret but it does say closed in the link so I didn't feel comfortable sharing it. However, you are better situated to know if it can be shared.
So... a comparison
Left, last version of cura, 7 hours...right previous version, less than 3 hours.
I imagine the amount of people thinking the their printer is faulty.... and the problem is Cura...
Circles on the bottom, right part, duo to playing with settings.
Yes, no secret but it does say closed in the link so I didn't feel comfortable sharing it. However, you are better situated to know if it can be shared.
It's free to share the link:
http://software.ultimaker.com/Cura_closed_beta/
(I should rename that place to something better, like "Cura beta versions"
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ArunC posted a topic in UltiMaker 3D printers,
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eldrick 65
Sketchup does a lousy job with .stl export.
In tinkercad you can select from Shape Generators / Community in the object bar, and find a cylinder with as many facets as you require.
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