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I just want a round cylinder

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Posted · I just want a round cylinder

After trying tinkercad and sketchup, if I design cylinder it is not well rounded and after printing it it looks horrible. You can see the faces of the polygons used to create the circle.

Could you please recommend me a CAD software where I can select the number of polygons for a cylinder, or at least the default value is good enough to have a rounded one?

Thanks in advance.

 

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Posted · I just want a round cylinder

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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Posted · I just want a round cylinder

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

 

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Posted · I just want a round cylinder

OpenSCAD can create great cylinders with any amount of faces you want.

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

This is the cylender. It has a wall thickness os 1.6 mm. 200 faces, scad.

gallery_34293_830_804839.jpg

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

 

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Posted · I just want a round cylinder

It looks like the infill overlap might be a bit on the high side.

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

I have increased wall thickness and the result is the same.

BTW, the ugly wall is visible in the inside face as well. :-| :-|

 

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Posted · I just want a round cylinder

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

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

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

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

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.

 

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Posted · I just want a round cylinder

So... a comparison

gallery_34293_830_112704.jpg

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.

 

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Posted · I just want a round cylinder

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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