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I drew a fairly simple model in Google SketchUp. I exported it as an STL. I imported it into Cura and exported as gcode. Then I printed the model.

All of the bottom layers of the model cover the entire space instead of leaving the two open gaps that should exist. I don't know why it's happening. Do I have some weird setting in Cura?

The section that is filled, but shouldn't be, isn't a raft. I printed without a raft because my model goes to the max extent that my printer can print and I don't have room for a raft around the edges.

Here is what it looks like in SketchUp:

SketchUp model

Here is what it looks like in Cura. The two empty areas are shaded darker than the other empty areas of the build plate. Is that an indication of my problem?

Cura Build Plate

Here is what was printed. The empty areas are solid and filled in as if the center piece extended to the inner edges of that area. (The jacked up corners are due to the model warping a bit and no longer being in the right position for subsequent layers.)

enter image description here

Here is a video of the layers according to Cura, and Cura clearly knows the gaps should be there:

https://youtu.be/r0a9gGFerHI

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  • $\begingroup$ I always check the "Layers" view in Cura to see what is actually going to the gcode. the Solid View only shows a representation of the original CAD item. $\endgroup$ – Carl Witthoft Dec 5 '17 at 18:26
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I suspect, as I am wont to do, that your problem lies in the STL created by SketchUp. It's an unfortunate aspect of that program that it creates non-manifold models which creates troubles such as this.

Consider to load your STL file into a program suitable for showing flaws (and repairing them) to determine where the failure points lie. I'm fond of Meshmixer, but there are many others such as Netfabb with which I am less familiar.

If you don't want to check your STL file, attach it to your post and I'll take a shot at it.

You would also want to consider to learn a new program if you intend to perform such 3D modeling. Fusion 360 has a popular following. I'm a fan of OpenScad, but use Fusion 360, Meshmixer, Blender (only a tiny amount) and anything else I can utilize for model repair, creation and editing. Build a large repetoire of different programs and get the best of all worlds.

SketchUp has a strong following primarily because it's rather easy to use. The same can be said of a few other programs, but SketchUp really generates trouble when it comes to 3D models.

TinkerCAD is very much like SketchUp and will give you better final results. OnShape is another popular modeling program, but I have zero exposure to that one.

It's not out of the question that there's a bug in Cura that's causing this problem. You are not limited to one slicer program, and you can check the results of another slicer such as Slic3r, Craftware or others.

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  • $\begingroup$ When I've had weird inverted faces before, Cura would highlight in red for me, but it's not doing that with this one. But just in case... I opened it in Blender and didn't see any problems with discolored faces (i.e. inverted faces). I selected all the faces and Recalculated Normals to re-orient the faces (this is how I've fixed weird problems with other models). Didn't see any change. $\endgroup$ – Kenny Wyland Dec 3 '17 at 3:01
  • $\begingroup$ Exported it as gcode and going to give that a try. I'll let you know how it turns out. $\endgroup$ – Kenny Wyland Dec 3 '17 at 3:12
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    $\begingroup$ Looks like that did it. Layer 1 is going down right now and it is showing the gaps. Thanks for the help! $\endgroup$ – Kenny Wyland Dec 3 '17 at 3:17
  • $\begingroup$ it's unfortunate that your post confirms SketchUp failure to create manifold 3D models. It's great that you were able to solve it, of course. $\endgroup$ – fred_dot_u Dec 3 '17 at 9:18
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You have a problem with your STL file. Check the orientation of the faces of your 3D model, if that is not the problem, search for a software to fix your stl file. Just a tip, give Fusion360 a try, it is the best!

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