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kolvenbag

Cura Gcode corrupted (?)

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Posted · Cura Gcode corrupted (?)

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.

Object As viewed In Cura 14.12.1

Object As Corrupted Gcode

 

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Posted · Cura Gcode corrupted (?)

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?

 

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Posted · Cura Gcode corrupted (?)

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.

 

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Posted · Cura Gcode corrupted (?)

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

 

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Posted · Cura Gcode corrupted (?)

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

Cup holder In Cura X Ray view

)

 

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Posted · Cura Gcode corrupted (?)

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

 

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Posted · Cura Gcode corrupted (?)

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

Nozzle jumping too much?

) 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?

 

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Posted · Cura Gcode corrupted (?)

@Team Ultimaker

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

 

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