Cura Gcode corrupted (?)

[kolvenbag 1]

I have an object designed in SketchUp 2015. I used the 'STL Import & Export' extension to generate a STL file. This one I loaded into Cura (14.12.1). In Cura the object visually looks fine. Then I generated the Gcode and started to print. Unfortunately, in the last part of printing the object, it printed with errors (awkward forms).

What does it look like?

The object is a cup holder to be used for coffee cups in a car. I have included two screenshots:

 

• A screenshot of the object loaded as STL in to Cura
  
• A screenshot from the viewer I used to view the Gcode generated by Cura
  

 

What did I check/do after this happened?

 

• I exported the SketchUp file again to STL (no different result)
  
• I checked & repaired the STL file via NetFabb (no different result)
  
• I downgraded Cura from v14.12.1 to v14.09 (no different result)
  

The object it self is 19.7cm x 16cm x 4.5cm.

Question

What is wrong?

Any advice is welcome.

 

[Dim3nsioneer 558]

It might be some flipped normals or some polygons standing strange... obviously something Netfabb cannot repair.

What does it look like in the layer view of Cura?

 

[kolvenbag 1]

Thanks for your suggestion. I have checked the layer view in Cura ... And, yes I found there that the misprint was already visible (no reason to start printing!).

I went back to my original design in Sketchup and found that in the pats were Cura showed the misprint, the object was having unlogical components. I changed that, exported to STL, reloaded in Cura and checked the layer view again: no errors!

At the moment I am printing again. I will let you know the outcome of that.

 

[Daid 306]

How does the object look in XRay view? any red parts indicate problem areas.

 

[kolvenbag 1]

Yes, in X-ray view there are some problem areas. I can see red triangles in both upstanding parts. (See screenshot

)

 

[Daid 306]

Well, those are "extra" triangles in your 3D model, which confuse Cura.

 

[kolvenbag 1]

The print result is there: everything worked out fine. The object in size and shape has been printed correctly!

There's only one thing bothering me with this object. I think the printing time is rather long (9h:53m) for this size and simplicity.

Looking at the way the nozzle is jumping during printing of one layer, something came to me. I noticed that the nozzle is jumping at moments that I didn't expect it to jump. What I mean is, the surface of one layer more or less has a logical pattern/order to be printed in such a way that the nozzle has minimal movement. Though I noticed that it is moving many times to reposition the nozzle and continue printing somewhere else. When you look at the printed object (see attached photo

) you can actually also see that the top layer shows many movement lines.

Do you recognize this? Do you have any idea how this happens?

 

[kolvenbag 1]

@Team Ultimaker

I guess you are right. Probably there is some hidden geometry inside, that causes confusing for printing. I will check that.