[Cura tolerance/accuracy]

Ok, to rule out Repetier as the culprit I opened them both in Simplify3D (which was developed completely independent of Repetier) and it shows basically the same thing. S3Ds gcode visualization is very good and exact so I trust it based on hundreds of prints I've done.

Here are the comparisons with 2 different angles shown:

http://i.imgur.com/HPlwjnn.jpg

http://i.imgur.com/xA89hKx.jpg

I have not printed this little test case (only my actual models, which have the same problem), but in either case I would probably need a good macro lens as its hard to show in photos what the eye can see easily. Plus, I don't want the discussion to detract into possible physical printer issues (i.e., if I had shown the actual prints first, people may blame settings, z-wobble, etc).

 

[Cura tolerance/accuracy]

Thanks Daid, I appreciate you looking into this. Did you see this photo (it was earlier in the thread) comparing Cura to S3D?

http://i.imgur.com/y0deIDw.jpg

I'm using Repetier for visualization since I find its easier to see anomalies such as this. While the variations are small, they are definitely large enough to show on my actual prints. Let me know if you need any other photos or models.

 

[Cura tolerance/accuracy]

I still can't seem to attach files, so instead I uploaded the files to Youmagine. Hopefully that works.

https://www.youmagine.com/designs/small-model-to-test-cura-slicing

I think you can get my settings from the gcode file, but let me know if you need an .ini.

 

[Cura tolerance/accuracy]

I think it may be because Cura isn't smoothing high poly-count parts, and instead faithfully reproduces lots of facets. I've seen something very similar on some of my high-poly parts, like 3D scans; the print ends up with a stucco texture, because the layers don't line up very well from one to the next, just as shown in your comparison photo.

 

That is a very good theory, but I don't think it is the issue in this case. It is actually relatively low-poly. There is no variation in z, so it is a single triangle describing the z-height, so there should be zero variation layer to layer. Here are 2 more pictures of the simple model I will attach when I'm able.

http://i.imgur.com/l7uqZN8.png

http://i.imgur.com/5o7CqOD.png

 

[Cura tolerance/accuracy]

Thanks, yes, I'm 2 posts away from restrictions hopefully.

 

[Cura tolerance/accuracy]

I have an STL/Gcode file but I can't seem to find the upload attachment option. Is this because I am a brand new forum member, or am I just not looking in the right spot?

 

[Cura tolerance/accuracy]

Hi Guys,

Yeah, I realize its a hard thing to describe. Here is a picture showing the difference between the gcode using Cura vs. Simplify 3D. Also, I have run my STL through netfab so I know it is clean.

http://i.imgur.com/y0deIDw.jpg

Is this typical with Cura? It is really the perimeters where the issue is (on a thin walled part).

 

[Cura tolerance/accuracy]

I was playing around with Cura for the first time and slicing some of my STL files, and I noticed there are small perturbations layer to layer (as if the perimeters on each layer are shifted in x/y very slightly) even though they don't exist in the STL file. These don't show up when slicing the same STL in Simplify 3D or KISSslicer.

So, my question is, does anyone know if there is a tolerance you can adjust in Cura to keep the gcode very tightly to the original geometry? Something like KISSlicer's oversample resolution.